Here's what rhymes with pyridostigmine.

Consider these alternatives

medroxyprogesterone / known azithromycin / rising pyrimethamine / nine ethidium / rubidium gabapentin / depending imipramine / nine etoposide / side benzyl / will isotretinoin / join venlafaxine / seen mitoxantrone / known echinacea / gymnasia butyrate / dibutyrate hydroxyzine / seen doxycycline / line