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Step 1
Look at phentermine's drug classification. It is a controlled substance because individuals may become addicted and is classified as a Schedule IV drug. Schedule I has the highest potential for abuse and Schedule V has the lowest, so phentermine has a relatively low potential for abuse.
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Step 2
Take phentermine for short-term use. The Food and Drug Administration generally recommends that its use be limited to 12 weeks because of drug tolerance. Phentermine may lose its effectiveness as an appetite suppressant after the body adjusts to it.
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Step 3
Read the contraindications and warnings. You should not take phentermine at all if you are allergic to any of the sympathomimetrics, have taken a medication similar to phentermine in the last 14 days or have a history of substance abuse. It is also contraindicated if you have an overactive thyroid, glaucoma, heart disease or high blood pressure.
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Step 4
Consult your doctor before taking phentermine if you are pregnant, about to become pregnant or breast-feeding.
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Step 5
Expect phentermine to be generally well-tolerated. The possible side effects are relatively mild and consistent with other amphetamines. Learn more about phentermine at LIVESTRONG.com.
