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When it's used as a treatment to increase your HDL cholesterol or correct a vitamin deficiency, niacin is sold in higher doses that are prescribed by your doctor. Prescription-strength niacin includes such drugs as Niacor and Niaspan. Niacin is also available as an over-the-counter supplement.
There are three different types of diet pills that you can buy. 1  Prescription weight loss pills are medications that you would get through your doctor. Non-prescription or over-the-counter (OTC) diet pills are medications that don't require a prescription. And finally, there are herbal supplements for weight loss that you'll find in many vitamin shops and drug stores.