The dosage is based on your age, medical condition, and response to treatment. There are many brands and forms of diphenhydramine available. Read the dosing instructions carefully for each product because the amount of diphenhydramine may be different between products. Do not increase your dose or take this medication more often than directed.
To prevent motion sickness , take your dose 30 minutes before starting activity such as travel. To help you sleep , take your dose about 30 minutes before bedtime. If you continue to have difficulty sleeping for longer than 2 weeks, contact your doctor. Tell your doctor if your condition does not improve or if it worsens. What conditions does Benadryl treat? If any of these effects persist or worsen, tell your doctor or pharmacist promptly.
To relieve dry mouth , suck sugarless hard candy or ice chips, chew sugarless gum, drink water, or use a saliva substitute. If your doctor has directed you to use this medication , remember that he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor right away if you have any serious side effects, including: Get medical help right away if you have any very serious side effects, including: A very serious allergic reaction to this drug is rare.
However, get medical help right away if you notice any symptoms of a serious allergic reaction , including: This is not a complete list of possible side effects.
If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. In Canada - Call your doctor for medical advice about side effects.
You may report side effects to Health Canada at List Benadryl side effects by likelihood and severity. Precautions Before taking diphenhydramine , tell your doctor or pharmacist if you are allergic to it; or to dimenhydrinate ; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. Before using this medication , tell your doctor or pharmacist your medical history, especially of: This drug may make you dizzy or drowsy or cause blurred vision.
Do not drive, use machinery, or do any activity that requires alertness or clear vision until you are sure you can perform such activities safely. Use in Newborn or Premature Infants: This drug should not be used in newborn or premature infants. Use in Nursing Mothers: Because of the higher risk of antihistamines for infants generally, and for newborns and prematures in particular, antihistamine therapy is contraindicated in nursing mothers. Antihistamines are also contraindicated in the following conditions: Hypersensitivity to diphenhydramine hydrochloride and other antihistamines of similar chemical structure.
Antihistamines should be used with considerable caution in patients with narrow-angle glaucoma, stenosing peptic ulcer, pyloroduodenal obstruction, symptomatic prostatic hypertrophy, or bladder-neck obstruction. Use in Pediatric Patients In pediatric patients, especially, antihistamines in overdosage may cause hallucinations, convulsions, or death.
As in adults, antihistamines may diminish mental alertness in pediatric patients. In the young pediatric patient, particularly, they may produce excitation. Use in the Elderly approximately 60 years or older Antihistamines are most likely to cause dizziness, sedation, and hypotension in elderly patients.
Diphenhydramine hydrochloride has an atropine-like action and therefore, should be used with caution in patients with a history of bronchial asthma, increased intraocular pressure, hyperthyroidism, cardiovascular disease or hypertension. Use with caution in patients with lower respiratory disease including asthma. Patients taking diphenhydramine hydrochloride should be advised that this drug may cause drowsiness and has an additive effect with alcohol.
Patients should be warned about engaging in activities requiring mental alertness such as driving a car or operating appliances, machinery, etc. Diphenhydramine hydrochloride has additive effects with alcohol and other CNS depressants hypnotics, sedatives, tranquilizers, etc.
MAO inhibitors prolong and intensify the anticholinergic drying effects of antihistamines. Carcinogenesis, Mutagenesis, Impairment of Fertility: Long-term studies in animals to determine mutagenic and carcinogenic potential have not been performed.
Pregnancy Pregnancy Category B Reproduction studies have been performed in rats and rabbits at doses up to 5 times the human dose and have revealed no evidence of impaired fertility or harm to the fetus due to diphenhydramine hydrochloride. You should also inform you doctor if you are pregnant, planning to conceive or breastfeeding as Benadryl may cause harm to your baby.
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