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Allergy and Benadryl

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Allergy Symptoms and Causes

An Allergy is a reaction by your immune system to something that does not bother most other people. People who have allergies often are sensitive to more than one thing. Substances that often cause reactions are

  • Pollen
  • Dust mites
  • Mold spores
  • Pet dander
  • Food
  • Insect stings
  • Medicines

Normally, your immune system fights germs. It is your body's defense system. In most allergic reactions, however, it is responding to a false alarm. Genes and the environment probably both play a role.

Allergies can cause a variety of symptoms such as a runny nose, sneezing, itching, rashes, swelling, or asthma. Allergies can range from minor to severe. Anaphylaxis is a severe reaction that can be life-threatening. Doctors use skin and blood tests to diagnose allergies. Treatments include medicines, Allergy shots, and avoiding the substances that cause the reactions.

NIH: National Institute of Allergy and Infectious Diseases

Check out the latest treatments for allergy

allergy treatment research studies

Benadryl clinical trials, surveys and public health registries


Find Drug Side Effect reports



Benadryl Side Effects

Off Label Use (183)
Dyspnoea (162)
Nausea (142)
Hypersensitivity (139)
Urticaria (126)
Somnolence (119)
Vomiting (116)
Loss Of Consciousness (113)
Rash (110)
Pain (109)
Pruritus (108)
Headache (108)
Overdose (105)
Dizziness (102)
Product Quality Issue (102)
Insomnia (96)
Heart Rate Increased (86)
Hallucination (80)
Feeling Abnormal (79)
Condition Aggravated (78)
Anxiety (46)
Infusion Related Reaction (46)
Tremor (45)
Fatigue (45)
Diarrhoea (43)
Convulsion (42)
Erythema (38)
Malaise (38)
Pyrexia (38)
Asthenia (37)
Swelling Face (37)
Blood Pressure Increased (37)
Pharyngeal Oedema (35)
Throat Tightness (34)
Dehydration (32)
Chest Pain (31)
Swollen Tongue (30)
Pain In Extremity (30)
Cough (30)
Oedema Peripheral (29)
Hypoaesthesia (29)
Chest Discomfort (29)
Incorrect Dose Administered (28)
Abdominal Pain Upper (27)
Eye Swelling (27)
Flushing (26)
Fall (26)
Confusional State (25)
Lip Swelling (24)
Syncope (24)

➢ More


Common Meds

Abilify (10132)
Adderall (1304)
Amlodipine (6664)
Amoxicillin (4387)
Benadryl (1568)
Celebrex (12876 )
Celexa (1342)
Cialis (2975)
Cipro (8580)
Citalopram (7792)
Crestor (18839)
Cymbalta (14373)
Doxycycline (1757)
Effexor (7289)
Flexeril (435)
Flomax (2177)
Fluoxetine (4261)
Gabapentin (4593)
Hydrocodone (2469)
Ibuprofen (8222)
Lantus (10968)
Lexapro (3499)
Lipitor (17769)
Lisinopril (8919)
Lyrica (27148)
Medrol (650)
Mirena (41254)
Mobic (957)
Morphine (5356)
Naproxen (538)
Neurontin (6501)
Oxycodone (4438)
Pradaxa (13372)
Prednisone (5926)
Prilosec (2631)
Prozac (1954)
Seroquel (27216)
Simvastatin (8348)
Synthroid (4452)
Tamiflu (5585)
Topamax (3748)
Tramadol (5054)
Trazodone (1458)
Viagra (5394)
Vicodin (1153)
Wellbutrin (6324)
Xanax (2847)
Zocor (5718)
Zoloft(6792)
Zyrtec(1669)

Recent Reviews

Alopecia areata........ anyone else?

Can I die from taking this many. Is it physicly addicting? Sorry about my spelling.

Convulsions and seizures sometimes for up to a week and a half at a time

Could I have had an allergic reaction to surgical gloves during a routine pap exam?

Does taking too much benadryl cause a person to fall asleep and not wake up?

Hi i like know about heavy dosage of benadryl side effects can anybody please give feedback waiting for positive response regards vijay

I have 2 question. First one is that my boyfriend has a pimple on his penis. To me it looks like a pimple on your face ingrowen type. He had this pimple maybe for a 3 weeks to a month Im not sure. Now he said he popped it. Could it be herpies. Hes th

I loved these strips. I have had allergic reactions to my own allergy shots. After waiting at the Dr.'s office for 15 minutes after my allergy shot, I leave to go shopping. Sometimes I can feel a little thickening in my throat, similar to when I'v

I take up to 50 Benadryl a day. How many should I take? I like how it makes me feel.

I was taking the loratadine 24 hr for about 4 months and past 3 months kept losing a lot of hair. Found bald spot few days ago and doc says alopecia areata. I saw a few postings on the internet of a correlation and wanted to know it anyone else has

<b>Describe Your Gastrografin Experience Here:</b>Itching, rash and diarrhea. Started as soon as test was finished. I ended up in the ER. I have an allergy to contrast dye. After reading about Gastrografin I see it contains Iodine.

About an hour after getting home from the hospital, I started with the sneezing fits. Lasted the rest of the day and all night an into the next morning. Felt like I had a very bad allergy attack or headcold.

After my 7th treatment of herceptin (first of herceptin alone - not with chemo) I had throat tightness, fluid in lungs, very irritated throat. Also nose bleeds, muscle and joint pain, mild swelling in hands and feet. Onc. suggested i take allergy pi

Allergy, rush

Before im taking dilantin but now im taking epanutin since this is the only available in my current location. im taking epanutin for 2 years already 400mg per day. 2 months before im experincing skin allergy/rashes at night. im taking medicine base o

Can it cure allergy on chicken foods??

Can you have allergy testing when on atenol

Dear, can i ask a question my son 19 month ago (1.6 year) has allergy, his IGE analysis was 50 when his old is 7 month. a doctor prescribes Finistil from about 10 month ago, and we till now give him about three teaspoon of finistil dialy from that da

Had my first Kenelog September 2010 apart from slight weight gain the only effects are that I feel great and no allergy symptoms ...it's a pain about the weight gain but such a relief to be able to breathe easily and taste food that it's a small pric

Hi, I get throat tightness and chest discomfort regularly....I began taking citrical/calcium around the same time I was diagnosed with a nickel allergy. A symptom of the allergy is mouth &amp; throat swelling and excess mucus. This leav

Allergy Clinical Trials and Studies

Treatments might be new drugs or new combinations of drugs, new surgical procedures or devices, or new ways to use existing treatments. The goal of clinical trials is to determine if a new test or treatment works and is safe. Clinical trials can also look at other aspects of care, such as improving the quality of life for people with chronic illnesses. People participate in clinical trials for a variety of reasons. Healthy volunteers say they participate to help others and to contribute to moving science forward. Participants with an illness or disease also participate to help others, but also to possibly receive the newest treatment and to have the additional care and attention from the clinical trial staff.
Rank Status Study
1 Recruiting Pharmacogenetic Factors and Side Effects of Metoclopramide and Diphenhydramine
Condition: Drug Metabolism, Poor, CYP2D6-RELATED
Interventions: Drug: Diphenhydramine;   Drug: Metoclopramide
Outcome Measures: Area under curve of metoclopramide (MCP);   Area under curve of diphenhydramine(DPH);   Cmax of metoclopramide;   Tmax of metoclopramide;   Cmax of diphenhydramine;   Tmax of diphenhydramine
2 Recruiting Diphenhydramine for Acute Migraine
Condition: Migraine
Interventions: Drug: metoclopramide;   Drug: diphenhydramine;   Drug: placebo
Outcome Measure: Sustained headache relief
3 Not yet recruiting Study of Promethazine for Treatment of Diabetic Gastroparesis
Condition: Diabetic Gastroparesis
Interventions: Drug: Promethazine;   Drug: Sugar pill
Outcome Measures: Change in patient-reported symptoms as measured by the Gastroparesis Cardinal Symptom Index score (GCSI, 14) from week 0 to week 4.;   Occurrence of adverse events;   Use of rescue medication;   The impact on work activity as measured by the Work Productivity and Activity Impairment Questionnaire. (WPAI).
4 Unknown  Adjunct Sedatives in Procedures Involving Endoscopic Ultrasound (EUS) and Endoscopic Retrograde Cholangiopancreatography (ERCP)
Conditions: Endoscopic Ultrasound (EUS);   Endoscopic Retrograde Cholangiopancreatography (ERCP)
Interventions: Drug: Saline;   Drug: Diphenhydramine;   Drug: Promethazine
Outcome Measures: Sedation Level;   Time to achieve adequate level of sedation to begin procedure;   Time for Recovery;   Adverse Symptoms From Sedative Agents
5 Not yet recruiting Diphenhydramine as an Adjunctive Sedative in Patients on Chronic Opioids
Conditions: Colonoscopy;   Adjunct Anesthesia Medication
Interventions: Drug: Diphenhydramine;   Drug: Placebo
Outcome Measures: Dosage of Fentanyl and Midazolam;   Quality of sedation;   Duration of Procedure;   Adverse events;   24 hour follow up
6 Unknown  Morphine Versus Morphine-promethazine Combination for Acute Low Back Pain Relief in the Adult Emergency Department
Condition: Low Back Pain
Interventions: Drug: Morphine-Promethazine;   Drug: morphine
Outcome Measures: Pain relief;   Ambulatory status
7 Recruiting Antitussive Effect of a Naturally Flavored Syrup Containing Diphenhydramine, Compared With Dextromethorphan and Placebo
Condition: Cough Reflex Sensitivity
Interventions: Drug: Phenylephrine;   Drug: Diphenhydramine;   Drug: Dextromethorphan
Outcome Measure: change in cough reflex sensitivity to capsaicin
8 Not yet recruiting Randomized Trial of Diphenhydramine Versus Continued Midazolam in "Difficult-to-sedate" Patients Undergoing Colonoscopy
Conditions: Sedation;   Endoscopy
Interventions: Drug: Diphenhydramine;   Drug: Midazolam
Outcome Measure: Proportion of patients who achieve adequate sedation to allow colonoscopy (defined as MOAA/S ≤3)
9 Recruiting Ketamine as a Rapidly-Acting Antidepressant in Depressed Emergency Department Patients
Condition: Depression
Interventions: Drug: Ketamine;   Drug: Diphenhydramine
Outcome Measures: Evaluate the effects of ketamine on depressive symptomatology;   Evalaute the effects of ketamine on treatment alliance;   Evalaute the effects of ketamine on suicidal ideation
10 Unknown  Does Thiamine Help Vomiting and Nausea in Pregnancy?
Condition: Hyperemesis Gravidarum
Intervention: Drug: thiamine & promethazine
Outcome Measure: the improvement in nausea and/or vomiting after treatment
11 Not yet recruiting Histamine Glutamate Antagonism in Stroke
Conditions: Acute Cerebrovascular Accident;   Cerebral Edema
Interventions: Drug: Diphenhydramine;   Drug: Pantoprazole;   Drug: Famotidine;   Drug: Dextromethorphan
Outcome Measures: Modified Rankin Score;   National Institutes of Health Stroke Severity (NIHSS) Scale;   Neurological examination of the subject;   All cause mortality data
12 Recruiting Pazopanib Versus Temsirolimus in Poor-Risk Clear-Cell Renal Cell Carcinoma (RCC)
Condition: Kidney Cancer
Interventions: Drug: Pazopanib;   Drug: Temsirolimus;   Behavioral: Quality of Life Assessment;   Drug: Benadryl
Outcome Measure: Progression Free Survival (PFS)
13 Not yet recruiting Psilocybin-facilitated Treatment for Cocaine Use
Condition: Cocaine-Related Disorders
Interventions: Drug: Psilocybin;   Drug: Diphenhydramine
Outcome Measure: The difference between the treatment and placebo groups in the number of participants with biochemically verified cocaine abstinence.
14 Recruiting FUS1-nanoparticles and Erlotinib in Stage IV Lung Cancer
Condition: Lung Cancer
Interventions: Drug: DOTAP:Chol-fus1;   Drug: Erlotinib;   Drug: Dexamethasone;   Drug: Diphenhydramine
Outcome Measures: Maximum Tolerated Dose (MTD) Level for Drug Treatment Combination;   Response Rate
15 Recruiting The Role of Intravenous (IV) Lidocaine in the Management of Chronic Neuropathic Pain of Peripheral Nerve Origin
Condition: Neuropathic Pain
Interventions: Drug: Lidocaine;   Drug: Diphenhydramine
Outcome Measures: Changes from Baseline Pain scores on the Visual Analog Scale at 6 weeks;   Hospital Anxiety and Depression Scale;   Modified Brief Pain Inventory;   Leeds Sleep Evaluation Questionnaire;   Patient Global Satisfaction with Treatment and Impression of Change;   Side Effects;   Quality of Life Health Outcome Instrument
16 Not yet recruiting Countermeasures to Reduce Sensorimotor Impairment and Space Motion Sickness Resulting From Altered Gravity Levels
Condition: Vestibular
Interventions: Drug: Promethazine;   Behavioral: Hyper gravity training;   Drug: Placebo;   Behavioral: No hypergravity training
Outcome Measure: Rate of recovery of roll tilt perception errors after exposure to hypergravity
17 Not yet recruiting First-time-in-man, to Assess the Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of BP1.5375
Condition: Healthy Male Volunteers
Interventions: Drug: BP1.5375 suspension;   Drug: Diphenhydramine;   Drug: Placebo
Outcome Measures: Single Ascending Dose - safety and tolerability (Part 1);   Proof of Concept - effect on polysomnography (Part 2)
18 Not yet recruiting A Double-Blind Trial of Psilocybin-Assisted Treatment of Alcohol Dependence
Condition: Alcohol Dependence
Interventions: Drug: Psilocybin;   Drug: Diphenhydramine;   Behavioral: Motivational Enhancement and Taking Action (META)
Outcome Measures: percent heavy drinking days;   Changes in vital signs;   adverse events;   Percent days abstinent;   drinks per drinking day;   days to first drinking day;   Days to first heavy drinking day;   consequences of drinking;   craving;   self efficacy;   Motivation to change drinking behavior
19 Recruiting Study Looking at End Expiratory Pressure for Altitude Illness Decrease (SLEEP-AID)
Condition: Acute Mountain Sickness
Interventions: Device: Theravent;   Device: Control
Outcome Measures: Incidence of acute mountain sickness;   number of nocturnal desaturations;   acute mountain sickness severity;   nocturnal awakenings;   subjective quality of sleep
20 Recruiting Treatment of Orthostatic Hypotension in Autonomic Failure
Conditions: Autonomic Failure;   Orthostatic Hypotension
Interventions: Drug: Atomoxetine;   Drug: Acarbose;   Drug: Pyridostigmine Bromide;   Drug: Yohimbine;   Drug: Midodrine HCl;   Drug: placebo;   Drug: Modafinil;   Drug: Octreotide;   Other: water intake;   Drug: Diphenhydramine Hydrochloride;   Drug: Ranitidine HCL;   Drug: Tranylcypromine;   Drug: Ergotamine/ Caffeine;   Drug: Celecoxib;   Drug: Pseudoephedrine;   Drug: Methylphenidate;   Drug: Indomethacin;   Drug: Ibuprofen;   Drug: Oxymetazoline 0.05% nasal solution;   Dietary Supplement: Bovril;   Drug: Acetazolamide;   Drug: Rivastigmine tartrate;   Drug: Carbidopa/levodopa;   Device: Inflatable abdominal binder;   Device: inflatable abdominal binder (sham)
Outcome Measures: Increase in seated systolic blood pressure 1-hr post drug compared to baseline.;   Increase in standing time 1-hr post drug compared to baseline