Of sedating antihistamines
As a result, the longer you take them, the less likely they are to make you sleepy.
Side effects might include daytime drowsiness, dry mouth and dizziness.
Topical preparations (ointments and creams) are often applied to insect bites but are not very effective as the antihistamine chemical does not penetrate the skin well.
Because some can cause serious side effects or interact with other medications you are taking, be sure to let your doctor know all the medications you take.
They do not always completely control the allergic reaction because they do not counteract other chemicals that may be responsible for the symptoms.