Femalegra 100 mg is marketed as a sildenafil-containing medicine. Sildenafil is a phosphodiesterase type-5 (PDE5) inhibitor that increases blood flow to genital tissues during sexual stimulation. Although sildenafil is well established for erectile dysfunction in men, its use in women is more complicated and is not generally an approved treatment for female sexual dysfunction. The FDA has noted that sildenafil has not been shown consistently to treat female sexual arousal disorders.