Valif Oral Jelly 20 mg is generally marketed as an oral jelly containing vardenafil 20 mg, a PDE5 inhibitor used to treat erectile dysfunction (ED). Vardenafil works by increasing blood flow to the penis when sexual stimulation occurs. It does not increase sexual desire and does not produce an erection without sexual stimulation. A 20 mg dose is generally the maximum recommended dose of vardenafil for most adults and should not be taken more than once in 24 hours unless specifically prescribed.