Phentermine: How Should I Take Phentermine

Content provided by Cerner Multum, Inc.

How should I take phentermine?

Take this medication exactly as it was prescribed for you. Do not take the medication in larger amounts, or take it for longer than recommended by your doctor. Follow the directions on your prescription label.

It is best to take phentermine on an empty stomach before breakfast, or at least 10 to 14 hours before bedtime.

Do not take more phentermine for an increased effect. Taking too much of this medication can cause serious, life-threatening side effects.

Do not crush, chew, break, or open an extended-release capsule. Swallow the pill whole. It is specially made to release medicine slowly in the body. Breaking or opening the pill would cause too much of the drug to be released at one time.

Phentermine should be taken only for a short time, such as a few weeks.

Taking high doses of phentermine over long periods of time can cause severe skin problems, sleep problems (insomnia), personality changes, and feeling hyperactive or irritable.

Stop taking phentermine if you have increased hunger or if you otherwise think the medication is not working properly.

You may have withdrawal symptoms when you stop using phentermine after a long period of use. Do not stop using the medication suddenly without first talking to your doctor. You may need to use less and less before you stop the medication completely.

Do not take phentermine in the evening because it may cause sleep problems (insomnia).

Store this medication at room temperature away from moisture and heat.

Keep track of how many pills have been used from each new bottle of this medicine. Phentermine is a drug of abuse and you should be aware if any person in the household is using this medicine improperly or without a prescription.

Last updated:	February 13, 2008