While there are cases of misuse and abuse, withdrawal symptoms from Benadryl are rare, even with long term use. Nevertheless, Benadryl has strong anticholinergic effects, and there have been reports of 'anticholinergic withdrawal' in some individuals taking Benadryl for extended periods of time. Potential symptoms include:Side effects of antihistamines that make you drowsy can include: sleepiness (drowsiness) and reduced co-ordination, reaction speed and judgement – do not drive or use machinery after taking these antihistamines. dry mouth. blurred vision. difficulty peeing. Side effects of non-drowsy antihistamines can include: headache. Diphenhydramine, brand name Benadryl ®, is one of the oldest and most frequently used over-the-counter medications for children. However, many better options are now widely available, all of which are faster acting, longer lasting, with less side effects. Antihistamines counteract the effect of histamine throughout the body, and treat a range ...Diphenhydramine or : Benadryl (diphenhydramine) may cause sedation the next day (due to its long half-life), decreased alertness, diminished cognitive function, delirium, ... Read More. Created for people with ongoing healthcare needs but benefits everyone. Learn how we can help. 5k views Reviewed >2 years ago. Diphenhydramine is a type of medicine called an antihistamine. It is used in some allergy and sleep medicines. Overdose occurs when someone takes more than the normal or recommended amount of this medicine. This can be by accident or on purpose. This article is for information only. DO NOT use it to treat or manage an actual overdose. Oct 9, 2018 · Many older adults may take sleeping pills because pain, nerve problems or other health issues are keeping them up at night, she says. For these people, a sleeping pill is standing in the way of ... Aug 25, 2021 · Examples of Viagra’s more commonly reported side effects include: headache. flushing (temporary warmth, redness, or deepening of skin color) stuffy nose. indigestion (upset stomach) mild vision ... Common Benadryl (diphenhydramine) side effects include drowsiness, dizziness, and blurry vision. Dry mouth and constipation are common, as well. Serious Benadryl side effects include a greater risk of falls — especially if you are an older adult — and potential long-term memory problems.Apr 9, 2020 · Diphenhydramine, brand name Benadryl ®, is one of the oldest and most frequently used over-the-counter medications for children. However, many better options are now widely available, all of which are faster acting, longer lasting, with less side effects. Antihistamines counteract the effect of histamine throughout the body, and treat a range ... Aug 1, 2023 · What are the side effects of Benadryl ... Diphenhydramine is only for short-term use until your symptoms clear up. ... (such as a long car ride, airplane or boat travel, amusement park rides, etc ... While there are cases of misuse and abuse, withdrawal symptoms from Benadryl are rare, even with long term use. Nevertheless, Benadryl has strong anticholinergic effects, and there have been reports of 'anticholinergic withdrawal' in some individuals taking Benadryl for extended periods of time. Potential symptoms include:Jul 5, 2023 · Benadryl is an antihistamine that can be used to treat allergic reactions, relieve motion sickness, as a sleep aid, and relieve some symptoms of Parkinson's disease. Sedation is a common side effect. 5. Tips. Benadryl may be taken with or without food. Take exactly as directed. Nov 24, 2022 · But it has quite a long list of possible side effects. In fact, the Canadian Society of Allergy and Clinical Immunology has given serious warnings about them, even for people. The organization issued a 2019 position statement about Benadryl. They advised against the drug because of the high risk of side effects and overdose. They said the drug ... Oct 3, 2022 · Applies to diphenhydramine: compounding powder, injectable solution, oral capsule, oral disintegrating strip, oral liquid, oral tablet, oral tablet chewable, oral tablet disintegrating. General The most commonly reported side effects included somnolence, dizziness, and incoordination. Nov 24, 2022 · But it has quite a long list of possible side effects. In fact, the Canadian Society of Allergy and Clinical Immunology has given serious warnings about them, even for people. The organization issued a 2019 position statement about Benadryl. They advised against the drug because of the high risk of side effects and overdose. They said the drug ... Benadryl and Depression. Although there is no direct effect of Benadryl on depression, regular and daily use of Benadryl does result in severe depression in the individual. It is believed to be helpful only for the short term, however, long term use of Benadryl results in certain depressive symptoms in the individual.Long term use of some antihistamines may increase your risk of dementia. Diphenhydramine (Benadryl®) blocks the effects of a neurotransmitter called acetylcholine. This neurotransmitter is vital for memory and learning. Diphenhydramine increased the risk of dementia by 54% in one 3,000 patient study followed for seven years.Jun 15, 2016 · IV administration of 50 mg of DPH resulted in immediate improvement of tremor, rigidity, tachycardia, and eye versions. The patient was started on oral DPH 50 mg 4 times a day and the dose was reduced by 25% every 3 days. Oral clonidine 0.1 mg 3 times a day and a weekly 0.1 mg transdermal patch was added to mitigate sympathetic side effects. hoarseness. lack or loss of strength. pain in the lower back or side. swelling of the hands, feet, or lower legs. trembling or shaking. Common side effects that do require medical attention ...Benadryl is an antihistamine that can be used to treat allergic reactions, relieve motion sickness, as a sleep aid, and relieve some symptoms of Parkinson's disease. Sedation is a common side effect. 5. Tips. Benadryl may be taken with or without food. Take exactly as directed.Oct 3, 2022 · Some dosage forms listed on this page may not apply to the brand name Benadryl Allergy. Summary. More frequent side effects include: sedated state and thickening of bronchial secretions. Continue reading for a comprehensive list of adverse effects. Applies to diphenhydramine: oral capsules and tablets, parenteral injection. Side effects include: Diphenhydramine, brand name Benadryl ®, is one of the oldest and most frequently used over-the-counter medications for children. However, many better options are now widely available, all of which are faster acting, longer lasting, with less side effects. Antihistamines counteract the effect of histamine throughout the body, and treat a range ...There could be both short- and long-term consequences. Worried about the side effects of Ambien, Lunesta or other sleep aids? ... Diphenhydramine is an anticholinergic drug, which means it blocks ...Benadryl may cause serious side effects including: pounding heartbeats or fluttering in your chest, painful or difficult urination, little or no urination, confusion, lightheadedness, tightness in your neck or jaw, and. uncontrollable movements of your tongue. Get medical help right away, if you have any of the symptoms listed above.Besides having side effects including drowsiness, confusion, and urinary retention, a new study shows that frequent, long-term use of older antihistamines are associated with an increased risk of ...Aug 1, 2023 · What are the side effects of Benadryl ... Diphenhydramine is only for short-term use until your symptoms clear up. ... (such as a long car ride, airplane or boat travel, amusement park rides, etc ... Addiction and Misuse. Another cause of overdose is an addiction to Diphenhydramine. Patients can become addicted to Benadryl after taking it for an extended period or when it is used for recreational purposes. Side effects of Diphenhydramine overdose often cause long-term damage, which can be fatal to patients ingesting it.Jul 7, 2022 · Advertisement constipation. blurred vision. memory problems and dementia (especially in seniors) anxiety. dependence. What are the side effects of taking Benadryl every night? SIDE EFFECTS: Drowsiness, dizziness, constipation, stomach upset, blurred vision, or dry mouth/nose/throat may occur. If any of these effects persist or worsen, tell your doctor or pharmacistRead More → Yeah, look at r/dph.Datura is even worse. It's like dph, but way more likely to kill you or make you go blind. Shadow people and spiders and having full conversations with people who don't exist usually only happens in the 400+ category. Between 150mg and there, it's usually just having to piss but being unable to, dysphoria/fear, beMay 8, 2019 · Answer. While Benadryl ( diphenhydramine) can safely be used once in a while as a sleep aid, long-term use is not recommended for multiple reasons. Even the intermittent use of Benadryl for sleep isn't generally recommended if you are elderly (over 65). Studies show that the elderly population doesn't metabolize Benadryl as quickly and are far ... Pay attention to the side effects of Benadryl, especially if you’re an older adult. The body responds differently to Benadryl as you get older. And you may develop side effects that were never a problem before. Benadryl is not intended to be used as a daily, long-term medication for sleep or other issues.Common Benadryl (diphenhydramine) side effects include drowsiness, dizziness, and blurry vision. Dry mouth and constipation are common, as well. Serious Benadryl side effects include a greater risk of falls — especially if you are an older adult — and potential long-term memory problems.Aug 25, 2021 · Examples of Viagra’s more commonly reported side effects include: headache. flushing (temporary warmth, redness, or deepening of skin color) stuffy nose. indigestion (upset stomach) mild vision ... Common Side Effects of Diphenhydramine. Diphenhydramine is considered an H1 receptor antagonist, and it works by blocking the effect of histamine in the body. The chemical reactions that diphenhydramine trigger in the body can cause other potentially significant sedative side effects on the central nervous system (CNS).Jul 5, 2023 · Benadryl is an antihistamine that can be used to treat allergic reactions, relieve motion sickness, as a sleep aid, and relieve some symptoms of Parkinson's disease. Sedation is a common side effect. 5. Tips. Benadryl may be taken with or without food. Take exactly as directed. Diphenhydramine, brand name Benadryl ®, is one of the oldest and most frequently used over-the-counter medications for children. However, many better options are now widely available, all of which are faster acting, longer lasting, with less side effects. Antihistamines counteract the effect of histamine throughout the body, and treat a range ...May 13, 2021 · The active ingredient in Benadryl is called diphenhydramine. Like any medication, Benadryl has several side effects. Some of the most common are: feeling sleepy or drowsy. dry mouth or throat ... Oct 3, 2022 · Applies to diphenhydramine: compounding powder, injectable solution, oral capsule, oral disintegrating strip, oral liquid, oral tablet, oral tablet chewable, oral tablet disintegrating. General The most commonly reported side effects included somnolence, dizziness, and incoordination. 1. McMillan JM, Aitken E, Holroyd-Leduc JM. Management of insomnia and long-term use of sedative- hypnotic drugs in older patients. CMAJ 2013;185:1499–505. [ PMC free article] [ PubMed] [ Google Scholar] 2. Gray SL, Anderson ML, Dublin S, et al. Cumulative use of strong anticholinergics and incident dementia: a prospective cohort study.Common Benadryl (diphenhydramine) side effects include drowsiness, dizziness, and blurry vision. Dry mouth and constipation are common, as well. Serious Benadryl side effects include a greater risk of falls — especially if you are an older adult — and potential long-term memory problems.Benadryl may cause blurred vision and may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert and able to see clearly. Drinking alcohol can increase certain side effects of diphenhydramine. Ask a doctor or pharmacist before using any other cold, cough, allergy, or sleep medicine.Impaired concentration. Memory difficulties. Anxiety. Stomach disturbances. Nausea and vomiting. A dry mouth. Constipation. Liver problems, etc. In certain people, a paradoxical reaction to diphenhydramine is possible, meaning that the drug causes different symptoms than the intended ones.There is evidence that the use of diphenhydramine among older adults or the elderly may result in serious side effects. This holds true esp. if you are older than age 65. The older a person becomes, the greater the risk of adverse effects. Benadryl is listed as potentially Inappropriate Medication in Older Adults ( also known as Beers criteria)One Benadryl per night seems to be enough to keep the ears dry & the resulting nausea at bay. I must admit that I'm not sure this is still even a problem for me. The last time I stopped to see if I still needed it was about 2 years ago. After 3 days, the dizziness/nausea/inner ear issues came back, so I promptly started taking the nightly ...Anxiety. Asthma. Car Sickness. Insomnia. Motion sickness. Reactions to Vaccines. Because one of the common side effect of Benadryl in dogs is drowsiness, your vet may use it to alleviate dog anxiety, particularly associated with traveling and motion sickness that may occur during plane rides or car trips.Diphenhydramine is an antihistamine used to relieve symptoms of allergy, hay fever, and the common cold. These symptoms include rash, itching, watery eyes, itchy eyes /nose/throat, cough, runny ...Diphenhydramine is a type of medicine called an antihistamine. It is used in some allergy and sleep medicines. Overdose occurs when someone takes more than the normal or recommended amount of this medicine. This can be by accident or on purpose. This article is for information only. DO NOT use it to treat or manage an actual overdose.“Atarax (hydroxyzine) and Benadryl (diphenhydramine) were routinely administered in the chemotherapy I received for breast cancer. After 5 months of chemo, I attributed my loss of mental function to a condition I read about called “chemo brain” — and chalked it up as another price paid in side affects for the benefit of staying alive.Aug 1, 2023 · skin rash. swollen joints. stomach discomfort, upset or pain. tender swollen glands in neck. tremor. unusual excitement, nervousness, restlessness, or irritability. vomiting. Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional. It can sometimes cause a decrease in memory, confusion, and thinking issues. These side effects are more common in elders. In addition, taking Benadryl long-term might increase the risk of dementia. People aged> 65 who took medications such as Benadryl daily for over three years had an increased risk of dementia.Experts say skip antihistamines. Dana Benson. 713-798-8267. Houston, TX - Jun 28, 2021. Share this article. For people who take an antihistamine such as Benadryl for a cold or allergies, drowsiness is often a welcome side effect. But a Baylor College of Medicine sleep expert cautions against turning to this type of medication as a sleep aid.In the drug realm, antihistamines such as diphenhydramine (Benadryl), chlorpheniramine (Chlor-Trimeton), cetirizine (Zyrtec), and loratadine (Claritin) can help with a stuffy nose are safe for the heart. Nasal sprays deliver a decongestant right where you need it. In theory, this should minimize cardiovascular effects.Uses Diphenhydramine is an antihistamine used to relieve symptoms of allergy, hay fever, and the common cold. These symptoms include rash, itching, watery eyes, itchy eyes /nose/throat, cough,... Overdosing on diphenhydramine (Benadryl) can also lead to more serious side effects like severe confusion, seizures, low blood pressure, involuntary muscle spasms, hallucinations (seeing things that aren't there), and heart rhythm problems. In fact, the FDA released a warning to avoid high doses of diphenhydramine.Jul 31, 2023 · Extrapyramidal side effects (EPS), commonly referred to as drug-induced movement disorders are among the most common adverse drug effects patients experience from dopamine-receptor blocking agents. It was first described in 1952 after chlorpromazine-induced symptoms resembling Parkinson disease.[1] A variety of movement phenotypes has since been described along the EPS spectrum, including ... Warnings What to ask your doctor Q&A Benadryl (diphenhydramine) is used for allergies and allergic reactions, as well as common cold symptoms. Benadryl can cause mild or serious side...Diphenhydramine is an antihistamine used to relieve symptoms of allergy, hay fever, and the common cold.These symptoms include rash, itching, watery eyes, itchy eyes/nose/throat, cough, runny nose ... Uses Diphenhydramine is an antihistamine used to relieve symptoms of allergy, hay fever, and the common cold. These symptoms include rash, itching, watery eyes, itchy eyes /nose/throat, cough,... Jun 5, 2019 · The Major Antihistamine Effects of Diphenhydramine Prevents Histamine-Mediated: constriction of respiratory smooth muscle. rapid vasodilation in blood vessels. increased capillary permeability and subsequent edema. sensations of itching, pain, and “flare” formation. increase in heart rate and strength of contraction. 1. McMillan JM, Aitken E, Holroyd-Leduc JM. Management of insomnia and long-term use of sedative- hypnotic drugs in older patients. CMAJ 2013;185:1499–505. [ PMC free article] [ PubMed] [ Google Scholar] 2. Gray SL, Anderson ML, Dublin S, et al. Cumulative use of strong anticholinergics and incident dementia: a prospective cohort study.Hives. Swelling and inflammation. Redness. Runny nose and eyes. Coughing. Sneezing. Anaphylactic reaction. One of the side effects of Benadryl is drowsiness, which can help to calm anxious dogs ...Higher dosage or long-term use of common drugs with anticholinergic effects is linked to significantly increased risk of dementia - including Alzheimer’s - says large study.Benadryl dosage for dogs. The correct dosage of diphenhydramine for dogs depends on their weight. A small dog will need much less than a big dog to receive the same positive effects. According to ...Diphenhydramine is an antihistamine used to relieve symptoms of allergy, hay fever, and the common cold. These symptoms include rash, itching, watery eyes, itchy eyes /nose/throat, cough, runny ...The Major Antihistamine Effects of Diphenhydramine Prevents Histamine-Mediated: constriction of respiratory smooth muscle. rapid vasodilation in blood vessels. increased capillary permeability and subsequent edema. sensations of itching, pain, and “flare” formation. increase in heart rate and strength of contraction.Long-Term Side Effects of Diphenhydramine Abuse. Continued diphenhydramine use can cause long-term adverse side effects that result in permanent damage. Not only will prolonged use cause harm, but it can lead to other aspects such as dependence on the medication. Common long-term side effects of prolonged diphenhydramine use include: Dependence. Jul 27, 2017 · Take one to two 50mg tablets at least 30 minutes prior to bedtime. The maximum dose of two tablets works best for sleep. You can take Dramamine with or without food, but make sure you take a dose with a full glass of water 1 2. Swallow tablets whole; don't crush or chew. Plan on taking Dramamine four to six hours prior to waking for the next ... May 13, 2021 · The active ingredient in Benadryl is called diphenhydramine. Like any medication, Benadryl has several side effects. Some of the most common are: feeling sleepy or drowsy. dry mouth or throat ... Benadryl and Depression. Although there is no direct effect of Benadryl on depression, regular and daily use of Benadryl does result in severe depression in the individual. It is believed to be helpful only for the short term, however, long term use of Benadryl results in certain depressive symptoms in the individual.Overdosing on diphenhydramine (Benadryl) can also lead to more serious side effects like severe confusion, seizures, low blood pressure, involuntary muscle spasms, hallucinations (seeing things that aren't there), and heart rhythm problems. In fact, the FDA released a warning to avoid high doses of diphenhydramine.While there are cases of misuse and abuse, withdrawal symptoms from Benadryl are rare, even with long term use. Nevertheless, Benadryl has strong anticholinergic effects, and there have been reports of 'anticholinergic withdrawal' in some individuals taking Benadryl for extended periods of time. Potential symptoms include:Overdosing on diphenhydramine (Benadryl) can also lead to more serious side effects like severe confusion, seizures, low blood pressure, involuntary muscle spasms, hallucinations (seeing things that aren't there), and heart rhythm problems. In fact, the FDA released a warning to avoid high doses of diphenhydramine.Extrapyramidal side effects (EPS), commonly referred to as drug-induced movement disorders are among the most common adverse drug effects patients experience from dopamine-receptor blocking agents. It was first described in 1952 after chlorpromazine-induced symptoms resembling Parkinson disease.[1] A variety of movement phenotypes has since been described along the EPS spectrum, including ...Examples of Viagra’s more commonly reported side effects include: headache. flushing (temporary warmth, redness, or deepening of skin color) stuffy nose. indigestion (upset stomach) mild vision ...May 8, 2019 · Answer. While Benadryl ( diphenhydramine) can safely be used once in a while as a sleep aid, long-term use is not recommended for multiple reasons. Even the intermittent use of Benadryl for sleep isn't generally recommended if you are elderly (over 65). Studies show that the elderly population doesn't metabolize Benadryl as quickly and are far ... Feb 18, 2010 · One Benadryl per night seems to be enough to keep the ears dry & the resulting nausea at bay. I must admit that I'm not sure this is still even a problem for me. The last time I stopped to see if I still needed it was about 2 years ago. After 3 days, the dizziness/nausea/inner ear issues came back, so I promptly started taking the nightly ... Hives. Swelling and inflammation. Redness. Runny nose and eyes. Coughing. Sneezing. Anaphylactic reaction. One of the side effects of Benadryl is drowsiness, which can help to calm anxious dogs ...Official answer. Diphenhydramine can be used as a short-term sleep aid to help ease occasional sleep problems. Older adults, children under age 16 and pregnant women should avoid taking diphenhydramine, as the risks to these groups may outweigh the benefits. Diphenhydramine should not be taken as a treatment for chronic insomnia. May 7, 2021 · There is evidence that the use of diphenhydramine among older adults or the elderly may result in serious side effects. This holds true esp. if you are older than age 65. The older a person becomes, the greater the risk of adverse effects. Benadryl is listed as potentially Inappropriate Medication in Older Adults ( also known as Beers criteria) Dizziness Nausea or vomiting Loss of appetite Constipation Increased chest congestion Headache Excitability (especially in children) Nervousness Benadryl can impair mental and motor functioning, as well as your performance at work or school. It can also impair a person’s ability to operate a motor vehicle or other potentially dangerous equipment.Applies to diphenhydramine: compounding powder, injectable solution, oral capsule, oral disintegrating strip, oral liquid, oral tablet, oral tablet chewable, oral tablet disintegrating. General The most commonly reported side effects included somnolence, dizziness, and incoordination.feeling of warmth, redness of the face, neck, arms and occasionally, upper chest. large, hive-like swelling on face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs. shortness of breath, difficult or labored breathing. Some side effects may occur that usually do not need medical attention.Potential Kidney Risks. Yes, long-term use of Benadryl can put strain on the kidneys, as it can build up in the system. This can cause toxicity and potentially lead to kidney damage. It's important to be aware of the potential side effects of long-term use and to consult a doctor if any symptoms arise.Aug 1, 2023 · What are the side effects of Benadryl ... Diphenhydramine is only for short-term use until your symptoms clear up. ... (such as a long car ride, airplane or boat travel, amusement park rides, etc ... Potential Kidney Risks. Yes, long-term use of Benadryl can put strain on the kidneys, as it can build up in the system. This can cause toxicity and potentially lead to kidney damage. It's important to be aware of the potential side effects of long-term use and to consult a doctor if any symptoms arise.Side effects of antihistamines that make you drowsy can include: sleepiness (drowsiness) and reduced co-ordination, reaction speed and judgement – do not drive or use machinery after taking these antihistamines. dry mouth. blurred vision. difficulty peeing. Side effects of non-drowsy antihistamines can include: headache. Jul 9, 2015 · Higher dosage or long-term use of common drugs with anticholinergic effects is linked to significantly increased risk of dementia - including Alzheimer’s - says large study. Apr 8, 2023 · The main long-term side effects of Plaquenil are eye-related. ... To manage your symptoms, they may suggest an over-the-counter antihistamine you take by mouth, such as Benadryl (diphenhydramine ... While there are cases of misuse and abuse, withdrawal symptoms from Benadryl are rare, even with long term use. Nevertheless, Benadryl has strong anticholinergic effects, and there have been reports of 'anticholinergic withdrawal' in some individuals taking Benadryl for extended periods of time. Potential symptoms include:
The short answer seems to be yes. While occasionally taking a Benadryl for sleep probably won’t lead to significant weight gain, chronic use of antihistamines can interfere with weight loss efforts. If you need an antihistamine for frequent allergy symptoms, however, the best choice is Claritin because it does not cross into the brain and has .... Verizon dollar800 trade in end date
One Benadryl per night seems to be enough to keep the ears dry & the resulting nausea at bay. I must admit that I'm not sure this is still even a problem for me. The last time I stopped to see if I still needed it was about 2 years ago. After 3 days, the dizziness/nausea/inner ear issues came back, so I promptly started taking the nightly ...But it has quite a long list of possible side effects. In fact, the Canadian Society of Allergy and Clinical Immunology has given serious warnings about them, even for people. The organization issued a 2019 position statement about Benadryl. They advised against the drug because of the high risk of side effects and overdose. They said the drug ...Benadryl helps reduce the effects of natural chemicals in the body called histamines. It is used to treat the side effects of an allergic reaction, including: Benadryl can be taken to relieve the symptoms of hayfever (seasonal allergies) and motion sickness. It can also be taken to induce sleep and treat certain symptoms of Parkinson's disease.Applies to diphenhydramine: compounding powder, injectable solution, oral capsule, oral disintegrating strip, oral liquid, oral tablet, oral tablet chewable, oral tablet disintegrating. General The most commonly reported side effects included somnolence, dizziness, and incoordination.Official answer. Diphenhydramine can be used as a short-term sleep aid to help ease occasional sleep problems. Older adults, children under age 16 and pregnant women should avoid taking diphenhydramine, as the risks to these groups may outweigh the benefits. Diphenhydramine should not be taken as a treatment for chronic insomnia.Jun 6, 2023 · Benadryl may cause serious side effects including: pounding heartbeats or fluttering in your chest, painful or difficult urination, little or no urination, confusion, lightheadedness, tightness in your neck or jaw, and. uncontrollable movements of your tongue. Get medical help right away, if you have any of the symptoms listed above. Diphenhydramine is a type of medicine called an antihistamine. It is used in some allergy and sleep medicines. Overdose occurs when someone takes more than the normal or recommended amount of this medicine. This can be by accident or on purpose. This article is for information only. DO NOT use it to treat or manage an actual overdose.“The antihistamine diphenhydramine is only approved for management of short-term or temporary sleep difficulties, particularly in those people who have problems falling asleep,” Dr. What are the negative effects of Benadryl? Drowsiness, dizziness, constipation, stomach upset, blurred vision, or dry mouth/nose/throat may occur. If any of ...Diphenhydramine is a common ingredient in sleeping aids; it is also used to treat allergies. While effective, the risk of serious diphenhydramine side effects—including confusion, dizziness, urinary retention, and liver or kidney issues—is increased in people age 65 and older.Answer (1 of 2): Here is one long term study: “These drugs are called anticholinergics, among them the first-generation antihistamines that are now marketed as sleep aids.Benadryl may cause serious side effects including: pounding heartbeats or fluttering in your chest, painful or difficult urination, little or no urination, confusion, lightheadedness, tightness in your neck or jaw, and. uncontrollable movements of your tongue. Get medical help right away, if you have any of the symptoms listed above..