Can long term use of antihistamine tablets cause side effects?
What are some common side effects of OTC antihistamines? Side effects from antihistamines aren’t common for healthy adults. However, side effects can be a concern for older adults or people who have health problems. First-generation antihistamines can make you feel very sleepy. This can affect your ability to drive or operate machines. It can also make it hard for you to think clearly. Antihistamines can cause your mouth and eyes to feel dry. Second-generation antihistamines are not as likely to cause these side effects. Should I avoid any foods, drinks or activities while taking antihistamines? Alcohol can increase the drowsiness caused by antihistamines. Also, be very careful if you drive a car or run machines while taking an antihistamine.