Serc is betahistine dihydrochloride. I have been taking it for over 3 years. I understand that you cannot take antihistamines when you are taking Serc. Antihistamines also cause me to have heart palpitations. I have some allergy problems that cause a lot of sneezing. Usually I just tough it out when the sneezing starts and I settle down after a while. I sometimes try extra strength Tylenol but I doubt it does much.
