Doctor insights on:
Different Types Of Antihistamines
Probably not: It is not a good idea because of the increased risk of side effects from taking multiple similar meds. ...Read more
If I have an allergy to one antihistamine, is it more likely to also be allergic to another? Even though they r different chemicals?
Itching in different body parts unrelated to food or indoor/outdoor areas. This might sit for few hours and sometimes I take antihistamines.?
Can you clarify: What your question is. Can re-ask. Thanks. ...Read more
How many weeks does it take for claritin (loratadine) 10mg to work? How long should I give it a try before deciding to switch to a different antihistamine?
Try for a few days: Antihistamines begin to work in less than an hour but a person may not feel significant relief for a few days. Claritin tends to be one of the weaker non-drowsy antihistamines. Others available without a prescription are Zyrtec, Allegra and Xyzal. If antihistamines are still not working then an evaluation by an allergist can be helpful to determine the cause of symptoms ...Read more
Yes: But why? Is it because a side effect of the drug, like itching? If so, better stop the Acamprosate and call/see your doctor, wish you well ...Read more
I have two different antihistamines...One is hydroxyzine and the other is is diphenhydramine. Which one will cause me to gain weight?
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
Is it possible to be allergic to all antihistamines (hives)? I see hives 90mins after taking 3 different antihit's on different days.
Why are the mg dosage of antihistamines different? Allegra is 180mg, Claritin (loratadine) is 5mg, and zyrtec is 10mg.
Do the antihistamine nose sprays and the steroid sprays lose their effectiveness over time? Should I alternate, using one type of spray each month?
Should not: These sprays should not lose their effectiveness over time. Some people need both in combination. I would suggest using the antihistamine spray and adding in the steroid spray when your symptoms are not controlled. It may take a couple of days to feel the full effect of the steroid spray. ...Read more
What type of allergies cause skin itching and bladder problems? Can't see an allergist because I have to take antihistamine to curb symptoms
U can still see: An allergist while on antihistamine, skin testing isn't indicated in every case. While I can't see any relation of skin itching and bladder problems, the bladder problem can be a side effect to using an antihistamine. Good history and physical exam are needed for good management of your case, best wishes ...Read more
35 yr-old with round-shaped skin lesions that come and go for 14 years, unresponsive to antifungals, and negative for "fungal, viral, or yeast".....?
Urticaria (hives): Typical description of chronic urticaria refractory to antihistamines. An Allergist will get some bloodwork to rule out some potential underlying causes and then prescribe treatment. There are several options and relief can be obtained in no time. ...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 more
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