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Dutasteride is actually FDA approved, but for benign prostate hypertrophy or prostate enlargement problems. The reason why it is not yet approved by the FDA for male pattern hair loss (MPTL) is because it is still in its testing stages. However, there are already doctors who prescribe this medication, especially for those who have tried and failed with finasteride.
Side effects of dutaseride include an increase in libido, but with a lowered sperm count. It is found to have a greater effect on the treatment of MPTL but of course, with more potent side effects.
The dosage will depend on what your doctor will prescribe for you, if he deems that you need it. The length of taking it will also depend on your condition. It is best to check with your doctor on this.
It is suggested to take finasteride first. If this does not work, then you can switch to dutasteride, but all with the advice and monitoring of your doctor.
Hope this helps.
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