The most common dosage instruction is to take one pill on an empty stomach right after you wake-up.
Phentermine may be broken or cut in half if it is taken in tablet form. Do NOT break, crush, or chew phentermine capsules.
As phentermine may disrupt normal sleep patterns, avoid taking a dose late in the day. If you are taking more than one dose daily, take the last dose approximately 4-6 hours before going to bed .
The following information pertains only to the average doses of phentermine, which may vary for different patients. If your dose is different from what is listed below, it is IMPORTANT to take the dose your doctor has prescribed. There are four forms of phentermine and the average doses are as follows [1, 2]:
Phentermine is NOT recommended for children who are under age 16.
Regardless of your prescribed dose, ALWAYS take phentermine as directed by your doctor.
Taking too much phentermine may cause unwanted effects or become habit-forming.
Speak with your doctor if you think that phentermine is not working properly after you have taken it for a few weeks. DO NOT increase the dose.
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If you miss a dose, take it as soon as possible.
However, if it is almost time for the next dose, skip the missed dose and take the scheduled dose. Do NOT take a double dose
If you or someone you know overdoses on phentermine, call your doctor or local poison control center right away.
If you experience any of the following symptoms of phentermine overdose call 911 or seek immediate medical attention:
A major overdose of phentermine can be fatal.
Do NOT share your phentermine prescription with others.
2. Mayo Foundation for Medical Education and Research [MFMER], Mayo Clinic. Drugs and supplements: Phentermine (Oral Route). MFMER, 2018. Retrieved from https://www.mayoclinic.org/drugs-supplements/phentermine-oral-route/proper-use/drg-20075169?p=1