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Phentermine: 7 things you should know

Medically reviewed by Carmen Pope, BPharm. Last updated on May 16, 2024.

1. How it works

2. Upsides

3. Downsides

If you are between the ages of 18 and 60, take no other medication or have no other medical conditions, side effects you are more likely to experience include:

Note: In general, seniors or children, people with certain medical conditions (such as liver or kidney problems, heart disease, diabetes, seizures) or people who take other medications are more at risk of developing a wider range of side effects. View complete list of side effects

4. Bottom Line

Phentermine may be used short-term as an aid to weight loss; however, it can be addictive and tolerance may develop to its weight-losing effects, rendering it less effective with time.

5. Tips

6. Response and effectiveness

7. Interactions

Medicines that interact with phentermine may either decrease its effect, affect how long it works, increase side effects, or have less of an effect when taken with phentermine. An interaction between two medications does not always mean that you must stop taking one of the medications; however, sometimes it does. Speak to your doctor about how drug interactions should be managed.

Common medications that may interact with phentermine include:

Avoid drinking alcohol or taking illegal or recreational drugs while taking phentermine.

Note that this list is not all-inclusive and includes only common medications that may interact with phentermine. You should refer to the prescribing information for phentermine for a complete list of interactions.

References

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use phentermine only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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