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Remember - Phentermine pills should not be taken by patients with glaucoma, hyperthyroidism, or a history of drug abuse or psychotic illnesses. Generally Phentermine pills is not recommended in patients with high blood pressure that is not well controlled.

You need to take the missed dose as soon as you remember. But, if it is almost time for your next dose or if it is already evening, skip the missed dose and take only your next regularly scheduled dose. A dose taken too late in the day will cause insomnia, you should not take a double dose of this medication.

As a rule patients on phentermine should have their blood pressure closely followed, insulin requirements may change in patients on phentermine; alcohol can cause a drug interaction. Abrupt stoppage of the drug can cause withdrawal with fatigue and depression.

Presently Phentermine pills is a sympathomimetic amine, which is similar to an amphetamine - an "anorectic" or "anorexigenic" drug. Phentermine stimulates the central nervous system (nerves and brain), which increases your heart rate and blood pressure and decreases your appetite.