Qsymia, or phentermine and topiramate extended-release, is in the drug class of anorexiants. Qsymia treats seizures, meaning that Qsymia is an anticonvulsant. Qsymia is also used to treat obesity, as it can help patients with weight loss. Qsymia is administered orally in capsule form so that the medication is an extended-release medication. One of the drugs within in Qsymia, phentermine, is frequently noted to be a habit-forming. This means that one can become addicted to Qsymia, so the patient must be very cautious in taking Qsymia so that an addition is not formed.