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?
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.
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
My doctor told me I have allergic rhinitis. He gave me a shot & said it was a "histamine shot" did I hear that wrong? Or could it be an antihistamine?
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
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.
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.
It depends: There are several formulations out and each is unique. Luckily, these are relatively safe drugs. Treat them with respect!
Depending: ...On the antihistamine in Question, do not use more than the recommended doses on the package unless instructed by your physician
Some can, some won't: I have had 2 yo kids develop the skill needed to handle taking a pill or tablet. Whether it is the proper dose at that age would depend on the medication.
Yes, if healthy: Antihistamines are available in pills, chewable tablets or liquid and can be safely taken by children of almost any age. Doses are not well defined in children less than 2 yrs of age.
Many choices: There are many excellent choices for antihistamines that are effective for treating hayfever. The new generation products work well and have few side effects. These include zyrtec (cetirizine), Allegra (fexofenadine), Claritin (loratadine), Clarinex (desloratadine) and xyzal (levocetirizine). The good news is that they are available without a prescription and most are available in several forms.
Depends: Most itchy skin rash are not mediated by histamine and thus whether it would respond to histamine or not would depend on the mechanism causing it. There is no harm in trying antihistamine even up to 4x the usual dose. The sedating ones tend to work better on itching due to sedating effect. Consult your doctor if antihistamine does not work.
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