Doctor insights on:
Long Term Loratadine
Prob ok: Antihistamines have been around for decades, and certainly many more potent than loratadine. They say worldwide the most common drug taken is diphenhydramine, mostly for the sedative properties (as a sleep aid). Antihistamines can affect certain types of glaucoma, and accentuate urine retention in those with prostate issues and dry mucous membranes, but usually not so much with loratadine per say. ...Read more
Headache is getting worse. I have been on claritin, (loratadine) flonaz, and zyrtec but nothing seems to help long-term. Any suggestions?
Evaluation: I would recommend that you confirm with your provider if allergies are the reason for your headache. You have used allergy medications to treat your headache and apparently have not had benefit. I think it may be likely that your headache is not allergy related at this point. ...Read more
I'm currently taking 8 claritin (loratadine) per day. It's entirely gotten rid of my allergies. Am I harming myself by doing this? Will it damage me long term?
Yes: This is an extremely high dose, and you won't benefit on the long or even the short term, although claritin (loratadine) is OTC, it doesn't mean you can overdose without a problem, you're personally liable and should follow the instructions carefully. As for your allergies, which I don't know their nature, there are other ways to control. Check aaaai.org or acaai.org for an allergist in your area, good luck ...Read more
3-5 days: The average half-life of Claritin (loratadine) is 8 hours meaning that half the dose is gone/metabolized after 8 hours and after 8 more hours another half is gone. Doing the math, the Claritin (loratadine) is effectively out of a person's system in 3-5 days, except in geriatric patients it could possibly take up to 10 days. ...Read more
One day: Claritin (loratadine) 10 mg pill is dosed once daily. That's because it's effect will last about 24 hours, after that it's antihistamine effect wanes. However, Claritin is metabolized by the liver into another active compound called desloratadine, so the antihistamine effect can last a while. This is why most allergists have patients stop their Claritin a number of days before skin testing them. ...Read moreSee 1 more doctor answer
Up to 1 hour: Claritin (loratadine) can work relatively quickly in most people. That is, it usually works within 30 minutes. However, in some people it may take up to 60 minutes to have its full effect. If it is not working within that time, or if the duration of effect becomes less and less, seeing an allergy specialist for allergy testing would be recommended as other treatments may be more effective. ...Read moreSee 1 more doctor answer
Pretty Quickly: Most antihistamines will start to work within the first 30-40 minutes. ...Read more
What are the differences between loratadine and desloratidine in how well it works or how long it lasts?
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