I have hives (it was triggered by mosquito bites 10 days ago). im taking claritin once a day in the morning and it seems to help. but it feels like it gets worked out by late afternoon. can i take a second dose in the evenings?

Yes: Loratidine products are some of the weakest oral antihistamines on the market. But a single 10mg daily dose may not meet the needs of every individual; it is safe to take a second dose. You may also experience better results with OTC products that contain cetirizine or levo-cetirizine as these have a faster onset of action and are generally much more effective than loratidine products.