If your medication gives you a dry mouth or makes you thirsty

If your medication gives you a dry mouth or makes you thirsty, then it may be causing fluid retention, and fluid retention results in weight gain and sensitivity to salt (and many other unpleasant and undesirable side-effects). If you want to reduce the weight gain then the options are: reducing the dosage, gradually weaning yourself off the drug, changing the medication to another, and/or seriously cutting down on salt and salty food. The most commonly prescribed drugs that tend to have this effect are anti-depressants, especially amitriptyline.