Hello michdee. Therefore Adipex will be in your system for approximately 137.5 hours (5.5 x 25) i.e.5.7 days (or 6 days). The active ingredient phentermine can still be detected in a hair sample for up to a month. Dr. Donald Alves answered. Dr. Jalal Zuberi answered 44 years experience Pediatrics They did not experience cravings for the drug or any other symptoms typically associated with amphetamine withdrawal. My doctor put me a … 24 years experience Emergency Medicine. How long does Phentermine stay in the urine? * Paracetamol is drug use for the pain management. * Paracetamol act on the peripheral nervous system to manage the pain. The active ingredient phentermine also has some severe side-effects that harm your body. If I take one tablet of phentermine 37.5 how long does it stay in your system as a drug? Dr. Jalal Zuberi answered 45 years experience Pediatrics Test yourself if using Phentermine. Talk with your doctor before starting an exercise program. If it is being used with legitimate prescriber, then even a … Asked 31 Mar 2011 by anacleta lucrecia Updated 25 January 2012 Topics phentermine It takes 5.5 half life's for the medicine to be totally eliminated. The actual theraputic effect of taking the Phentermine would be about 24 hours. A study in the International Journal of Obesity conducted with patients who were taking phentermine long term for durations of up to 21 years found that phentermine did not result in psychological dependence in any of the patients. Do not crush, break, or chew it. Phentermine (Adipex-P), an amphetamine derivative, is the most prescribed weight loss medication in the United States.Available as a low cost generic, phentermine has been approved for weight loss since 1973. How long and will Phentermine stay in your system? Carefully follow your doctor's instructions for a reduced-calorie diet plan and regular exercise. Adipex (phentermine) has a half life of approximately 25 hours. I think I lost 20 lbs in my first month. How long does half of one 37.5 mg phentermine tablet stay in your system which would show up on a drug test. The key to it is to make sure you stay to your calorie count and drinks lots of water. About 14 days: Is how long internet resources suggest it might appear in a urine drug test. And the answer is — like for other drugs, time frames vary from person to person. I have to go to my local health dept. How long would phentermine stay in your system? This is one of the most asked questions about Phentermine because of its similarity to amphetamines and false-positive results of a drug screen. The drug can be detected up to 6 days in your system. for a refill on my birth control pills, as well as have some lab work done and today was the 2nd day that i have been taking phen. 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