None of the antihistamines or decongestant type meds list weight gain as a side effect. Steroid type medications do though, including the inhaled types. Many pills do contain small amounts of cornstarch as a filler, or lactose as a carrier (ie, helps it get into the bloodstream) ... but the amounts are generally very, very small, often less than 1/10th of a gram per pill.

Decongestants have the lovely side effect of making your mucous membranes very dry .. ie, the lining of the nose and mouth. Be sure to drink lots of water. I found during my sinus cold last week, while I was taking Contac C and Claritin that even my coffee made me more dehydrated than usual, so I had less coffee and more water .

Just a caution for readers: do not take decongestant medication if you are also using a thermogenic weight loss aid with ephedra or ephedrine in it. Many OTC decongestants contain pseudoephedrine, and the two together are dangerous. Talk to the pharmacist to be sure.

Doreen