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Hello, My name is***** am a board certified physician, and would be happy to help you with your health concern today. Please give me a few minutes to read, and respond to your question.
I'm sorry to hear that you are suffering from an allergic reaction. You can take the claritin twice daily (10 mg each, or 20 mg total per day). You can also take the Zantac twice daily. If you still having no significant improvement by tomorrow, I would recommend that you consider being seen by a doctor to discuss prescription treatment which will work more effectively.
I hope that you feel better soon.
Yes, you can take all of the medications together to help resolve the allergic reaction faster. You will experience drowsiness, but the side effects will resolve by the morning.