Take 1 to 2 tablets every 4 to 6 hours or as directed by a doctor.
An overdose of Benadryl may result in extreme drowsiness, blurred vision, increased heart rate, confusion, seizures – even coma. Other symptoms may include dry mouth, nausea, vomiting, unsteadiness, high blood pressure, and hallucinations.
A: You can take a dose of Benadryl every 4 to 6 hours if you are a healthy adult or teen. But don’t exceed 300 mg per day. Taking high doses and taking doses close together can increase the risk of side effects, such as drowsiness or dizziness.
Is it OK to take Benadryl every day to treat my allergies? A. It’s not a good idea. Benadryl Allergy ( diphenhydramine and generic) and similar first-generation antihistamines used to treat allergy symptoms, such as chlorpheniramine (Chlor-Trimeton Allergy and generic), shouldn’t be taken for long periods of time.
Maximum dosage Oral Benadryl products shouldn’t be taken more than 6 times each day. For adults and children over 12 years of age, the maximum is 300 mg each day. For children ages 6 to 12 years, the maximum is 150 mg each day.
Benadryl takes about 15 to 30 minutes to start working and its peak effect happens around 2 to 4 hours. An adult dose to obtain sedating effects is between 25 and 50 milligrams.
The U.S. Food and Drug Administration (FDA) is warning that taking higher than recommended doses of the common over-the-counter (OTC) allergy medicine diphenhydramine ( Benadryl ) can lead to serious heart problems, seizures, coma, or even death.
Common side effects may include: dizziness, drowsiness, loss of coordination; dry mouth, nose, or throat; constipation, upset stomach; dry eyes, blurred vision; or. day-time drowsiness or “hangover” feeling after night-time use.
Examples of medications that may interact with Benadryl include: antidepressants. stomach ulcer medicine. cough and cold medicine. other antihistamines. diazepam (Valium ) sedatives.
For adults and teens, the diphenhydramine dosage is 25 to 50 mg every 4 to 6 hours. The maximum amount you should take in one day is 300 mg. Keep in mind, taking higher doses can increase the risk of side effects, including drowsiness.
Diphenhydramine (Benadryl) Dose Table
|Child’s weight ( pounds )||20-24||25-37|
|Liquid 12.5 mg/ 5 milliliters (mL)||4||5|
|Liquid 12.5 mg/ 1 teaspoon (tsp)||¾||1|
|Chewable 12.5 mg||—||1|
|Tablets 25 mg||—||½|
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.
Diphenhydramine undergoes extensive first-pass metabolism, whereby 50–60% of ingested medication is metabolized by the liver before reaching the systemic circulation. Nearly all the available drug is metabolized by the liver within 24–48 hours, thus increasing risk for liver injury.
In a report published in JAMA Internal Medicine, researchers offers compelling evidence of a link between long-term use of anticholinergic medications like Benadryl and dementia. Anticholinergic drugs block the action of acetylcholine. This substance transmits messages in the nervous system.
Exposure to diphenhydramine over the short term can make older folks a little squirrely, but long – term use over many years may lead to Alzheimer’s disease. If people are unable to achieve a good night’s sleep, they really need to consult with a physician.