Phentermine is used, in combination with diet
and exercise, to help you lose weight. It works by decreasing your
appetite.
This medication is sometimes prescribed for
other uses; ask your doctor or pharmacist for more information.
How should this medicine be
used?
Phentermine comes in tablets and
extended-release capsules. It usually is taken as a single daily dose in
the morning or three times a day 30 minutes before meals. Follow the
directions on your prescription label carefully, and ask your doctor or
pharmacist to explain any part you do not understand. Take phentermine
exactly as directed.
Most people take the drug for 3-6 weeks; the
length of treatment depends on how you respond to the medication.
Phentermine can be habit-forming. Do not take a larger dose, take it more
often, or for a longer period than your doctor tells you to.
To prevent side effects, phentermine should be
taken with meals. If you are taking an extended-release (long-acting)
product, do not chew or crush the tablet. There are some tablets that can
be crushed and mixed with food.
What special precautions
should I follow?
Before taking phentermine,
tell your doctor and pharmacist if you are allergic to phentermine or
any other drugs.
tell your doctor and pharmacist what prescription and nonprescription
medications you are taking, especially fluoxetine (Prozac), fluvoxamine
(Luvox), guanethidine, insulin, MAO inhibitors [phenelzine (Nardil) and
tranylcypromine (Parnate)] even if you stopped taking them within the
past 2 weeks, medications for weight loss and depression, paroxetine (Paxil),
sertraline (Zoloft),and vitamins.
tell your doctor if you have or have ever had heart disease, high blood
pressure, arteriosclerosis (narrowing of the arteries), hyperthyroidism
(overactive thyroid gland), diabetes, glaucoma, or a history of drug
abuse.
tell your doctor if you are pregnant, plan to become pregnant, or are
breast-feeding. If you become pregnant while taking phentermine, call
your doctor.
you should know that this drug may make you drowsy. Do not drive a car
or operate machinery until you know how this drug affects you.
remember that alcohol can add to the drowsiness caused by this drug.
if you have diabetes, you may need a larger dose of insulin while taking
phentermine. Call your doctor if you have questions or problems.
What special dietary
instructions should I follow?
Follow the diet and exercise program your
doctor has given you. Phentermine works best in combination with a diet
program.
What should I do if I forget a
dose?
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 continue your regular dosing schedule. Do not take a double dose to
make up for a missed one.
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