(S)-Pramipexole enantiomer. A dopamine-D2-receptor agonist. Antiparkinsonian. Pramipexole (Mirapex, Mirapexin, Sifrol) is a non-ergoline dopamine agonist indicated for treating early-stage Parkinson’s disease (PD) and restless legs syndrome (RLS). It is also sometimes used off-label as a treatment for cluster headache and to counteract the problems with sexual dysfunction experienced by some users of the selective serotonin reuptake inhibitor (SSRI) antidepressants.