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Known interactions

Celexa, Celexa Solution, Chlorpromazine, Chlorpromazine Concentrate or Syrup, Chlorpromazine Extended-Release Capsules, Chlorpromazine Injection, Chlorpromazine Intensol Concentrate, Chlorpromazine Suppositories, Citalopram, Citalopram Oral Solution, Citalopram orally-disintegrating tablets, Compazine, Compazine Injection, Compazine Rectal Suppositories, Compazine Spansules, Compazine Syrup, citalopram orally-disintegrating tablets, Effexor, Etrafon, Fluoxetine and Olanzapine, Fluoxetine capsules (Sarafem), Fluoxetine Oral Solution, Fluoxetine tablets or capsules, Fluphenazine, Fluphenazine Injection, Fluphenazine Oral Concentrate or Elixir, Fluvoxamine, Furazolidone, Furazolindone Oral Suspension, Furoxone, Furoxone Oral Suspension, fluoxetine delayed-release capsules, Isocarboxazid, Luvox, Marplan, Mellaril, Mellaril Suspension, Mellaril-S, Mesoridazine Injection, Mesoridazine Oral, Mesoridazine Oral Concentrate, Nardil, Parnate, Paroxetine, Paroxetine Oral Suspension, Paxil, Paxil CR, Paxil Suspension, Permitil, Permitil Oral Concentrate, Perphenazine and Amitriptyline, Perphenazine Injection, Perphenazine Oral, Perphenazine Oral Concentrate, Phenelzine, Prochlorperazine, Prochlorperazine ER, Prochlorperazine Injection, Prochlorperazine Oral Syrup, Prochlorperazine Rectal Suppositories, Prolixin, Prolixin Decanoate, Prolixin Elixir, Prolixin Enanthate, Prolixin Injection, Prolixin Oral Concentrate, Prozac, Prozac Oral Solution, Prozac Weekly, Sarafem, Serentil, Serentil Injection, Serentil Oral Concetrate, Sertraline, Sertraline Oral Solution, Sonazine Concentrate, Sonazine Syrup, Stelazine, Stelazine Injection, Symbyax, Thioridazine Suspension, Thioridazine Tablets, Thor-Prom, Thorazine, Thorazine Concentrate, Thorazine Injection, Thorazine Spansule, Thorazine Suppositories, Thorazine Syrup, Tranylcypromine, Triavil, Trifluoperazine Injection, Trifluoperazine Oral Concentrate, Trifluoperazine Oral Tablets, Trilafon, Trilafon Concentrate, Trilafon Injection, Venlafaxine, Zoloft, Zoloft Oral Solution.

Using of Phentermine

Brand Name(s): Adipex-P, Fastin, Obestin-30, Phentermine resin oral

Generic Name Phentermine

What are phentermine capsules or tablets?

PHENTERMINE (Adipex-P®, Fastin®, Phentamine®, Zantryl®) helps you lose weight. Combined with a reduced calorie diet, it can help you reduce weight by decreasing your appetite. Generic phentermine is available.

What should my health care professional know before I take phentermine?

They need to know if you have any of these conditions:

  • diabetes
  • glaucoma
  • heart disease
  • high blood pressure
  • kidney disease
  • thyroid disease
  • taken other medicines to lose weight in the past year
  • an unusual or allergic reaction to phendimetrazine, other medicines, foods, dyes, or preservatives
  • pregnant or trying to get pregnant
  • breast-feeding

How should I take this medicine?

Take phentermine capsules or tablets by mouth. Follow the specific directions on the prescription label. Swallow the capsules or tablets with a drink of water at least 30 minutes before eating. Do not take your medicine more often than directed.

What if I miss a dose?

If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.

What drug(s) may interact with phentermine?

  • linezolid
  • medicines for blood pressure
  • medicines for diabetes
  • medicines for mental depression
  • other medicines or herbal products for weight loss or to decrease appetite

Tell your prescriber or health care professional about all other medicines you are taking, including nonprescription medicines, nutritional supplements, or herbal products. Also tell your prescriber or health care professional if you are a frequent user of drinks with caffeine or alcohol, if you smoke, or if you use illegal drugs. These may affect the way your medicine works. Check with your health care professional before stopping or starting any of your medicines.

What side effects may I notice from taking phentermine?

Side effects that you should report to your prescriber or health care professional as soon as possible:

  • breathlessness on exertion
  • chest pain
  • depression or severe changes in mood
  • dry cough
  • heart palpitations
  • increased blood pressure
  • severe dizziness
  • problems urinating
  • vomiting

Side effects that usually do not require medical attention (report to your prescriber or health care professional if they continue or are bothersome):

  • a false sense of well being
  • blurred vision or other eye problems
  • changes in sexual ability or desire
  • constipation
  • diarrhea
  • difficulty sleeping
  • dizziness
  • dry mouth
  • fatigue
  • flushing
  • headache
  • irritability
  • nervousness or restlessness
  • nausea
  • sweating
  • unpleasant taste

What should I watch for while taking phentermine?

Notify your physician immediately if you become short of breath while doing your normal activities.

Keep in mind that phentermine was intended to be used in addition to a healthy diet and exercise. The best results are achieved this way. While your prescriber or health care professional will most likely prescribe phentermine for only a few months; however, some people have used it for longer periods. Eventually your weight loss may "level out". At that point, the drug will only help you maintain your new weight. Do not increase or in any way change your dose without consulting your prescriber.

Do not drive, use machinery, or do anything that requires mental alertness or physical coordination until you know how phentermine affects you. Alcohol can increase the possibility of experiencing side effects with phentermine. Therefore, it is best to avoid alcoholic drinks.

Where can I keep my medicine?

Keep out of the reach of children in a container that small children cannot open.

Store at room temperature between 15 and 30 °C (59 and 86 °F). Throw away any unused medicine after the expiration date.


(Note: The above information is not intended to replace the advice of your physician, pharmacist, or other healthcare professional. It is not meant to indicate that the use of the product is safe, appropriate, or effective for you.)

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