Doctor insights on:
What will happen to the antihistamine , if histamine is not even presentreaction what will my body do with that antihistamine?
Say again: Try again, Joe. What is your question? ...Read more
Can i take expectorant+antihistamine combi cough syrup? aren't the actions contradictory? expectorant increasing & anti-histamine drying secretions?
Do histamines (not antihistamine medications) make you drowsy? Antihistamines (no decongestants added) seem to make me more alert when allergies flare
Yes: Histamine is a substance released during an allergic attack and can cause drowsiness. Some of the older generation anti-histamine agents (like benedryl) can cause drowsiness because they can pass the "blood brain" barrier and cause a direct effect on thinking. In rare cases in adults, antihistamines can cause agitation. ...Read more
Zantac (ranitidine) has histamine ingredients. I'm taking it recently.noticed some inverse effect,my hives is not popping out too!It should be antihistamine right?
Zantac (ranitidine): Is an antihistamine itself, it blocks H2 receptors, histamine has more than one type of receptors in the human tissues. H1, blocked by the usual antihistamines, H2, plays a role in stomach acid regulation, which zantac (ranitidine) blocks. Zantac at times is used in severe allergic reactions or severe urticaria, together with H1 blockers to control symptoms, so your deduction is right ...Read more
Diphenhydramine: 300 mg/day from all sources, 50 mg in one dose q 6 hours, it is the most widely used OTC. Other OTC 2nd generation antihistamines as cetirizine , loratadine or fexofenadine have different dosing but can be taken once a day, and develop tolerance as with diphenhydramine with prolonged usage ...Read more
Package instructions: The package instructions will give the recommended dosages for over the counter medication. Prescriptions will give the proper dosing of antihistamines and other medications. Usual dosing takes into account other medications you might be taking plus a margin of safety. When in doubt, ask your physician. ...Read more
Anti-histamines: They can be h1-receptor antagonists such as Benadryl (diphenhydramine) or periactin or loratadine. Or, h2-receptor antagonists such as tagamet or ranitidine. Or, h3/h4 receptor antagonists (experimental) such as thioperamide. Or, atypical antihistamines such as catechin. Or, others such as cromolyn. ...Read more
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