Doctor insights on:
Is it OK to take multiple types of antihistamines within a 24-hour period? Nothing seems to work as long as advertised.
DETAILS?????: What are you treating? Which antihistamines? How many of each? There are easy answers after the details are given. No answer is possible without this information. For chronic urticaria I may manage it with 10 or 20mg cetirizine (Zyrtec) in AM and hydroxyzine at bedtime. I never use Benadryl (diphenhydramine) except as a sleeping pill. ...Read more
I'm 17 and took 3 loratadine tablets, 10 mg/ Antihistamine in the last 24 hours, are there going to be any issues I should be worried about ?
Probably not but...: Long acting anti-histamines should not be used more than one in 24 hours. Taking more has been associated with heart issues but that is still unlikely to occur. If you have any chest palpitations you should be evaluated. For future reference, these medications can take 4 - 6 hours to work. If you are still not getting relief you can safely add a short acting anti-histamine (Benadryl). ...Read more
I gave expired antihistamine syrup to my 30 months old son incidentally...Is it dangerous?What s the side effect on him?
Expired drugs: There should be no side effects as expiration is usually based on loss of drug effectiveness. Drug companies err on the side of shortening times to expiration. Actually many drugs are effective long after expiration dates. Expired drugs are commonly used effectively by volunteer organizations when no other drugs are available. Relax! ...Read moreSee 1 more doctor answer
I'm due to have a thyroid scan in 3 days. Yesterday, I took two 25 mg antihistamine pills. Will this affect the results?
Older ones do: First generation antihistamines (benadryl, clor-pheramine, atarax) cross the blood brain barrier and cause lethargy. Second generation (allegra, claritin, zyrtec, xyzal, (levocetirizine) clarinex) cause the blood brain barrier at a much lesser amount and more targeted to the h1 receptor. ...Read more