Doctor insights on:
Antihistamines Non Drowsy
Can a non drowsy antihistamine that had no side effects that I've noticed hurt you if u take 2 pills in 24hrs instead of 2?
No: Which antihistamine? Why using it? Sometimes, for chronic urticaria, cetirizine [Zyrtec] is dosed at 3 a day . The official dose of these is 1 a day. Allegra and claritin are also sometimes used at double or triple dose.It is best if you consult a Dr before you take doses higher than usual. ...Read more
Yes: Claritin is a second generation antihistamine which causes much less drowsiness than first generation antihistamine, like benadryl (diphenhydramine). The number of people who feel drowsy on Claritin is so low that it is labeled "non-drowsy". But each of us is unique. I have plenty of patients who feel drowsy on claritin, especially petite women. ...Read moreSee 1 more doctor answer
Bitten by unknown insect. Redness and swelling to forarm. Marked with pen and doubled in size over 36hrs. Taking non drowsy antihistamines and icing?
Ice: Benadryl (or your choice of a non-sedating antihistamine such as Zyrtec, Claritin, or Allegra), ice, and ibuprofen is a good initial treatment for insect bites. Infection is a possible delayed complication. If you develop a boil, a discolored blister, fever, increasing pain, or other concerning signs, see a physician for an exam. ...Read more
Zyrtec (cetirizine) makes me very drowsy. Is this common and are there non-drowsy antihistamines that provide as effective allergy relief? Thanks
Yes: This is a common side effect of Zyrtec, but it is different for everyone. If Zyrtec makes you drowsy, you could try the other 2 common anti-histamines instead - Allegra or Claritin (loratadine). Some people have been drowsy with these medicines as well, but others have not. Best wishes. ...Read more
Is it safe to take a non drowsy antihistamine while also taking adderall (dextroamphetamine and racemic amphetamine)?
Please let me know if there is anything that contains the same ingredients that Benadryl (diphenhydramine) has but its non drowsy?
Antihistamine: Benadryl (diphenhydramine) is the first generation antihistamine that has anticholinergic property and crosses the blood-brain barrier causing drowsiness. Several other second generation antihistamine works well and does not cause drowsiness like zyrtec, allergra and claritin. ...Read more
Allegra (fexofenadine): If you are referring to over-the-counter antihistamines than Allegra (fexofenadine) is considered one of the most non-sedating on the market. Airline pilots can take this medication while flying so it has been proven to be non-sedating. Other non-sedating antihistamines include Zyrtec and Claritin (loratadine). ...Read more
Complex: Histamine is a wake promoting neurotransmitter in the brain. Older antihistamines like Benadryl (diphenhydramine) cross into the brain and block this center allowing for drowsiness to occur. The newer antihistamines like alleges, claritin, zyrtec do not cross as easily and are less likely to promote drowsiness. ...Read moreSee 1 more doctor answer
Allergy Med: This is not a fair question, and I am sorry, but i must disagree with dr. Kwok. The sole oral antihistamine that does not cross the blood brain barrier and does not cause drowsiness in fexofenadine (aka.. Allegra). Every other otc oral antihistamine has the risk of drowsiness. Most effective is also not fair bc every patient is different and we tailor therapy to the patient. C ur allergist. ...Read moreSee 3 more doctor answers
Claritin (loratadine): Hello, I have treated many people with allergy with antihistamines. Even though they are listed as non sedating, some people react to these medications in an unexpected fashion. Sedation may still occur and if this is present, i usually recommend using this medication if needed at night before sleep. It will still work for 24 hours and may help with allergy and sleep. ...Read more
Yes but: A decongestant is often added to antihistamine and would counteract some of the drowsy effects but that is not a good solution. There are at least two other non-drowsy antihistamines available and steroid nasal spray actually works far better without the drowsy effect. If your only choice is a sedating antihistamine, take it an hour before you go to bed instead of the morning. ...Read more
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