Phentermine is used as an appetite suppressant. It is as part of an overall weight reduction program that also includes dieting, exercise, and counseling.
How to take this medication
This medication is best taken on an empty stomach one half-hour before breakfast. Because this medication may cause sleeplessness, avoid taking a dose late in the day. Take this medication as prescribed. Do not take it more often or longer than directed.
Side effects
Side effects cannot be anticipated. If any develop or change in intensity, inform your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking this medication.
Side effects may include:
Changes in sex drive, constipation, diarrhea, dizziness, dry mouth, exaggerated feelings of depression or elation, headache, high blood pressure, hives, impotence, inability to fall or stay asleep, increased heart rate, overstimulation, restlessness, stomach or intestinal problems, throbbing heartbeat, tremors, unpleasant taste.
Precautions
Tell your doctor your complete medical history especially if you have high blood pressure, an over-active thyroid, glaucoma, diabetes or emotional problems. Consult with your doctor if you think you are pregnant or before breast-feeding. Alcohol can increase unwanted side effects of dizziness. Limit alcohol use. Phentermine is not recommended for use in children. Consult your doctor or pharmacist for further information.
Drug interactions
Inform your doctor about all the medicines you use, (prescription and nonprescription) especially if you take high blood pressure medicine or MAO inhibitors (e.g., furazolidone, phenelzine, selegiline, tranylcypromine) or any other weight loss medicine. Avoid 'stimulant' drugs that may increase your heart rate such as decongestants or caffeine. Decongestants are commonly found in over-the-counter cough and cold medicine.
Notes
Phentermine is not a substitute for proper diet. For maximum effects, this must be used in conjunction with a diet and exercise program. Do not share this medication with others.
Miss dose
If you miss a dose, do not double the next dose. Instead, skip the missed dose and resume your usual dosing schedule.
Storage
Store at room temperature away from sunlight and moisture. Keep this and all medications out of the reach of children.
