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Doctor insights on: Phentermine Drug Interactions

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Dr. Gail Altschuler
400 doctors shared insights

Phentermine (Definition)

Phentermine is been around for about 60 years. Phentermine is an appetite suppressant the bariatrician in the winter of 2008. Has a article gives a great description of the medication phentermine. I have used Phentermine over the last nine years without any complications whatsoever. We only give a half of a 37.5 mg ...Read more


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What were the prescription or over-the-counter drug interactions seen in the qsymia (phentermine and topiramate) study? Anything people really have to watch out for?

What were the prescription or over-the-counter drug interactions seen in the qsymia (phentermine and topiramate) study? Anything people really have to watch out for?

Few to consider..: Qsymia=phentermine+topiramate: causes many side effects. Rare but serious ones: allergic reaction, high blood pressure, heart valve disorders, tremors, psychosis, pancreatitis, liver failures, thus careful with decongestant (pseudafed/phenylephrine), antihistamines 9zyrtec/benadryl), and tylenol (acetaminophen) containing products. Consult doc if u need to take these meds. Good luck. ...Read more

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Can you get addicted to the drug phentermine?

Can you get addicted to the drug phentermine?

Sure: Phentermine is a stimulant & fully capable of being the source of addiction. There is a difference between physiological tolerance &/or withdrawal -vs- addiction. To be addicted you need one of the biological features (tolerance or withdrawal), loss of control (despite negative consequences), & salience (it becomes an important part of your life). ...Read more

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Will suddently stopping phentermine have drug withdrawal effects?

Will suddently stopping phentermine have drug withdrawal effects?

Never heard of WD: Phentermine has some properties similar to amphetamines, but it is not an amphetamine.If you abruptly stop Phentermine most patients might be more hungry for 24-48 hrs. Then return to regular appetite.There has never been a report of physical addiction.Emotionally, regaining wt w/o the med use could cause emotional stress.I have found that with monitoring pts. They can take the med for maintenance. ...Read more

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How long does half of one 37.5 mg phentermine tablet stay in your system which would show up on a drug test.

How long does half of one 37.5 mg phentermine tablet stay in your system which would show up on a drug test.

Half life is 20h: The drug's half life is 20 hours, meaning that after 20 hours, half of the dose has been eliminated. 20 hours after that, 3/4 of the dose has been eliminated and 20 hours after that 7/8 of the drug has been eliminated. At 80 hours virtually all of the drug has been eliminated. Depending on sensitivity of urine test you should allow 60-80 hours for elimination. Thanks for trusting HealthTap! ...Read more

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I took a half tab of phentermine and then was givin a drug test 2 days after. Was the only time i had taken the drug the whole month. Will it show up?

I took a half tab of phentermine and then was givin a drug test 2 days after.  Was the only time i had taken the drug the whole month. Will it show up?

Probably Not: Most drug tests do not test for phentermine, this assumes you are using prescription phentermine obtained from your doctor, buying what is labelled "phentermine" on the internet is another story, many contain amphetamines which will test positive lesson learned: be careful what you put into your body! real Phentermine is inexpensive & can be obtained from any weight loss doc. ...Read more

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Does phentermine and ritilin show on employer saliva drug tedt?

Does phentermine and ritilin show on employer saliva drug tedt?

Possibly: It is hard to know exactly what the drug test includes, and I am not sure of the sensitivity of the saliva test, but ritalin (methylphenidate) is an amphetamine, and drug screens often include amphetamines. If you are on a prescription drug that is legally prescribed, you should divulge this to your employer before the test. ...Read more

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What's the difference between the diet drugs meridia and phentermine?

What's the difference between the diet drugs meridia and phentermine?

Different drugs: Meridia is a wt loss medication that was taken off the market in 10/2010 due to cardiovascular risk. Phentermine is another weight loss medication that is still being used and is approved for short term weight loss therapy. Meridia inhibits noreprnephrine/epinephrine and Dopamine reuptake, Phentermine works on the sympathetic system and cause you to eat less. ...Read more

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I havent taken phentermine in 3 weeks will it show in urine drug test?

I havent taken phentermine in 3 weeks will it show in urine drug test?

Not likely: Three weeks is long enough for this drug to clear out of your system. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex. Get HPV vaccine. ...Read more

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How long does phentermine stay in your system for a salvia drug screen ?

How long does phentermine stay in your system for a salvia drug screen ?

3 days: Stimulant similar to amphetamines, is a controlled substance and drug of abuse. time in saliva tox screens, is about 3 days, depending on your overall health, what other meds you take (legal or illegal) See https://www.erowid.org/psychoactives/testing/testing_info1.shtml ...Read more

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Can phentermine and topamax (topiramate) give a fasle positive on a drug test?

Yes and no: phenteanine is an amphetamine and will show up on a drug test. Topomax will not show up on a standard drug test, ...Read more

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I took drug test today which is Tuesday I have to go back Friday morning if I stop taking my prescription for Phentermine 37.5 today will I be cleaned by Friday?

I took drug test today which is Tuesday I have to go back Friday morning if I stop taking my prescription for Phentermine 37.5 today will I be cleaned by Friday?

No need to wait: If you have a legitimate prescription for a federally legal medication (not marijuana) than the entity doing the drug testing will not hold you accountable for testing positive for that substance. They may restrict you from working with certain dangerous or delicate tools or driving until you are done with that medication. Bring the Rx or a note from your doc explaining the Rx. ...Read more

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Is the weight loss drug phentermine (fastin) effective?

Is the weight loss drug phentermine (fastin) effective?

Yes, but...: ...there is a price--talk to your doctor about risks & side effects! Also, it is important to have realistic expectations when starting a weight loss medicine--e.g. about 5-10% of the starting weight is the average weight loss most patients on these drugs will achieve. Finally, once the drug is stopped, gradual weight gain is statistically likely. ...Read more

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If phentermine is taken approximately an hour before giving a urine drug screen, will it show up?

If phentermine is taken approximately an hour before giving a urine drug screen, will it show up?

Most likely: especially if you take it on a regular basis but I don't know if the drug or the metabolites are being tested for . if you have a prescription for them it should be ok ...Read more

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How long does phentermine take to absorb in the urinary system so it will show in a urine drug test?

Five days: Phentermine adult half-life is variable between 7 to 20 hours. It takes approximately 6 half lives for a drug to be eliminated from your system. 20*6/24=5 days. The Phentermine will stay in your system for approximately 5 days. ...Read more

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What combination of drug store fat burners could i take for weightloss that could give me great results like phentermine does?

What combination of drug store fat burners could i  take for weightloss that could give me great results like phentermine does?

You can check online: For this. But be careful with overuse of diet pills. It may cause unwanted effects including elevated blood pressure, chest pain, palpitation etc. Consult your dr before you take these meds. Best of luck! ...Read more

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