21st November 2019

mayoclinic
15

How many times a day can you take antihistamines?

For oral dosage form (capsules): Adults and teenagers—60 milligrams (mg) two times a day as needed or 180 mg once a day. Children 6 to 11 years of age—30 mg twice a day as needed.

Similarly one may ask, what are the side effects of taking too many antihistamines?

They cause much more drowsiness and fatigue than the newer antihistamines. (In fact, these antihistamines sometimes are used as sleeping pills.) Side effects can include dizziness, poor coordination, dry mouth, nausea and vomiting, blurred vision, and trouble urinating.

How long does it take to get Claritin to work?

"3 days to reach peak: Claritin (loratidine) takes 3 days to reach a steady state, so it could take that long for it to work on hives. Other non-drowsy antihistamines are a better choice: Allegra (fexofenadine) reaches peak effect within 2 hours and Zyrtec (cetirizine) reaches peak effect in 1-2 hours."
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