Orlistat is the only drug of its kind that's approved in the u.s. all other prescription weight loss drugs curb your appetite, including the following. naltrexone hcl and bupropion (contrave) how. Four prescription weight-loss drugs are approved by the u.s. food and drug administration (fda) for long-term use: bupropion-naltrexone (contrave), liraglutide (saxenda), orlistat (xenical) and phentermine-topiramate (qsymia). most prescription weight-loss drugs work by decreasing appetite or increasing feelings of fullness, and some do both.. What’s the difference between prescription and non-prescription weight loss pills? prescribed weight loss drugs basically alter the chemicals in our brains. the brain is made up of about 100 billion neurons, also known as nerve cells. neurons communicate with each other by using chemical messengers called neurotransmitters..
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