Psychotropic drugs can do anything to you (especially if you've seen all of medication law action commercials on TV). Has she had her lithium level checked? Lithium is very hard to dial-in to a therapeutic dose because the therapeutic and toxic doses are so close together. My libido on lithium was nill. Paxil effected my libido the most: could not finish and retro-ejaculation. All psychiatric meds are horrible. I've taken at least 40-50 of them over 28 years with very little relief.