I have been taking three benadryls a day for about one and a half months. The other day, I began to feel exhausted and continually thirsty. No matter how much I drink, I feel thirsty. How long will this last?

It will last as long as you are taking the benadryl. Do you mind telling us why you have been taking the benadryl for so long?

I was trying to get rid of some hives on my face and was told Benadryl was the best. It has been two and a half days since I have taken some benadryl, but still feel groggy and thirsty (but not as bad).

I was trying to get rid of some hives on my face and was told Benadryl was the best. It has been two and a half days since I have taken some benadryl, but still feel groggy and thirsty (but not as bad).