Does phentermine affect thyroid blood test?
I'm taking Phentermine for weight management as prescribed by my doctor. I also have a thyroid condition and get regular blood tests. Does Phentermine affect thyroid blood test results, doc?
5 answers
4 months ago
Most liked
Yes, it can sometimes interfere with how your thyroid hormones are metabolized or how the test results show up. When you go for your blood draw, always make sure the lab technician and your doctor know exactly what supplements or weight loss pills you are taking.
4 months ago
Please don't ignore this. I once hid my weight loss pills from my doctor, and my thyroid results came back completely messed up, delaying my actual treatment. Be totally honest with your specialist and get a fresh test done under their guidance.
Powered by
Consult a endocrinologist
yrs exp
4 months ago
It absolutely can. Stimulants like phentermine alter your metabolic markers, which can give a skewed picture of your T3, T4, or TSH levels. Talk to your prescribing doctor before you head to the lab.
4 months ago
Phentermine can affect your central nervous system and metabolic rate, which may indirectly influence your thyroid function tests. It's best not to guess these things. Consult your endocrinologist, as they might ask you to stop the medication for a few days before the test.
Related reads
All articles
A two-step TB skin test is often required for healthcare workers and others who need routine screening bu...
Fitness and Exercise
Understanding Normal Blood Sugar Levels in Adults
Normal blood sugar levels in adults typically range from 70-99 mg/dL when fasting and below 140 mg/dL two...
4 months ago
I was actually researching this online because my cousin is on a weight loss program. From what I read, it can affect thyroid levels, especially TSH, because of how it stimulates the brain. Better to ask a doctor to confirm this though.