Phentermine comes in capsule form, to be taken by mouth.
It should be taken in the morning, before breakfast or 1 to 2 hours after breakfast. Avoid taking late in the evening as it may cause insomnia (difficulty sleeping at night).
Take this medication as instructed by your doctor. Do not exceed the recommended dose to increase the effect as it may cause other side effects.
Take the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and take only your regularly scheduled dose. Do not take a double dose to make up for the missed one.