Interactions of Phentermine With Other Substances

Phentermine is a potent weight loss drug that acts on the central nervous system to trigger the release of chemicals which suppress appetite or render the body feeling full for longer periods of time.

By law, a valid prescription is required before Phentermine can be dispensed. A medical specialist must know the dieter’s medical history as well as all his vitamins, supplements and other medications, as there are several contraindicated substances and drugs that can be very dangerous when ingested with Phentermine.

Drugs or Medicines To Avoid With Phentermine:

• Drugs with the generic names Dexfenfluramine, Fenfluramine, Furazolidone, and MAO inhibitors. Phentermine interaction with these medicines can be dangerous and even fatal. Phentermine and Fenfluramine has particularly proven to be a bad combination because this mix creates cardiac valvular lesions.
• Guanadrel (Hylorel) and Guanathidine (Ismelin) drops considerably in effectiveness when combined with the intake of Phentermine
• Antacids reduce the excretion of Phentermine when the body needs to flush out a certain amount. The prescription dosage may be too much if a reasonable amount of Phentermine stays in the blood when it should have gone out.
• Acetazolamide, Dichlorphenamide,Methazolamide may also decrease the excretion of Phentermine.
• Tricyclic antidepressants such as Amitriptyline, Amoxapine, Clomipramine and Doxepine can cause hypertension and other cardiac problems when taken with Phentermine.
• Anti-anxiety drugs such as Xanax or Valium
• Over-the-counter cold and cough medicines can promote high blood pressure and palpitations when taken with Phentermine
  

Other Substances to Avoid With Phentermine:

• Alcohol increases the side effects of Phentermine and can be dangerous especially when the combination impairs judgement and reaction time.
• Food and beverages with caffeine. Caffeine is a stimulant. When taken with Phentermine, its effects are heightened and can cause strong anxiety attacks, high blood pressure and rapid heartbeats. Caffeine may also slow down the effects of Phentermine.
• Omega-3 fish oil, Vitamins B,C and D also decreases the appetite suppressing effects of Phentermine.
• Other weight loss supplements
  

Before you accept a prescription, make sure you have told your health practitioner what medications you have taken in the last six months. Include whatever supplements you have as well. This will give the prescriber a sound background on which to base his prescription.

Special care and attention to detail is needed when taking prescription medicine. In case you don’t feel comfortable about taking a weight loss drug, you may want to try a weight loss supplement you can get over the counter. Sometimes, supplements can be much safer and just as effective. Phentramin-D is a safe, non-prescription choice that could take Phentermine’s place. Phentramin-D offers the same appetite suppressing potency as Phentermine but with milder side effects. See how Phentramin-D can work for you.