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How much antihistamine is in benadryl?

Benadryl (diphenhydramine) is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose. Benadryl is used to treat sneezing, runny nose, watery eyes, hives, skin rash, itching, and other cold or allergy symptoms.

What are the bad side effects of Benadryl? Common Benadryl 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.

How many Benadryl can you safely take at once? In general, it is safe to take up to 6 tablets of Benadryl 25mg per day. In fact, the maximum daily dose of Benadryl is 300mg per day, which equates to 50mg (two Benadryl tablets), every four hours (six times daily).

Is Benadryl and UNISOM the same thing? Unisom and Benadryl are both in the same class of medications and are classified as “first-generation” antihistamines. They have the same mechanism of action and similar side effects. When these two medications are used together, it is highly likely that the side effects will be more severe than when either medication is used alone.

How many Benadryl should I take? Benadryl most commonly comes in 25 mg tablets and you can take 1 or 2 tablets (25 mg or 50 mg) every 4 to 6 hours. This translates to you being able to take Benadryl 4 to 6 times a day. The maximum daily dose of Benadryl is 300 mg or 12 tablets.

What are the side effects of too much Benadryl?

What are the side effects of too much Benadryl? 2 doctors agreed: Several: The most common side effect of taking too much Benadryl (diphenhydramine) would be excessive drowsiness. Other possible side effects include dizziness, headache, constipation, urinary retention, and heart palpitations.

What are the long-term effects of using diphenhydramine?

Common long-term side effects of prolonged diphenhydramine use include:

  • Dependence. For some, diphenhydramine can cause addictive effects when engaging in long-term use of the substance.
  • Circulation. Those who use diphenhydramine for extended periods can experience low blood pressure, which can result in heart palpitations.
  • Mental challenges.
  • Physical problems.

How does Benadryl react with other medications? Benadryl may interact with monoamine oxidase inhibitors (MAOIs), other over-the-counter cough, cold, allergy, or insomnia medications, anxiety or sleep medicines, antidepressants, or any other medications that make you feel drowsy, sleepy, or relaxed. Tell your doctor all medications and supplements you use.

What are the contraindications of Benadryl? Benadryl should not be used in neonates and premature infants (see CONTRAINDICATIONS). Benadryl may diminish mental alertness, or, in the young pediatric patient, cause excitation. Overdosage may cause hallucinations, convulsions, or death (see WARNINGS and OVERDOSAGE).