may cause erectile dysfunction
although rarely (less than 1 in 100 patients taking it). It may also cause (rarely) various neurological/psychological disorders like depression
both of which may decrease the sexual drive, but not only that (more symptoms are expected). Impaired libido per se is not expected...
Always keep in mind that when a symptom coincides with the initiation of a new drug then the drug is the most likely offender - directly or indirectly - regardless of its theoretical potential to cause side effects but you can't prove it unless you exclude all other potential causes. The best way to find out is by stopping the drug. If the symptoms disappear and only reappear after you re-start the drug then the cause is almost certainly the drug.
I hope you find my comments helpful!