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Hair loss is listed as a very rare side effect of the drug. It doesn’t appear to often in the medical journals, which again proves that it is rare but not impossible.
If you started losing hair while on this drug, you should immediately see a doctor who prescribed the drug to you. If it were due to medication, I suppose it should grow back some time after the drug was stopped but other possible causes should be looked into as well.

It happens often that hormonal problems lead to hair loss. Both sexual hormones as well as thyroid hormones imbalance can induce hair loss. Bringing back the balance usually helps.
It could also be a sign of an underlying disease like diabetes or even lupus, so it is essential you talked to your doctor about it.