Phenergan (promethazine) belongs to a group of drugs called phenothiazines. It works by changing the actions of chemicals in your brain. Promethazine also acts as an antihistamine. It blocks the effects of the naturally occurring chemical histamine in your body. Phenergan is used to treat allergy symptoms such as itching, runny nose, sneezing, itchy or watery eyes, hives, and itchy skin rashes. Phenergan also prevents motion sickness, and treats nausea and vomiting or pain after surgery. It is also used as a sedative or sleep aid. Phenergan is not for use in treating symptoms of asthma, pneumonia, or other lower respiratory tract infections.

Xenical (orlistat) blocks some of the fat that you eat, keeping it from being absorbed by your body. Xenical is used to aid in weight loss, or to help reduce the risk of regaining weight already lost. This medicine must be used together with a reduced-calorie diet and is to used only by adults. Xenical is the prescription-strength form of orlistat. The alli brand of orlistat is available without a prescription.

Wellbutrin (bupropion) is an antidepressant medication used to treat major depressive disorder and seasonal affective disorder. Wellbutrin may also be used for purposes not listed in this medication guide.