dose of vardenafil should not exceed 5 mg (see section ). Vardenafil may be administered at any time with tamsulosin. GlaxoSmithKline (GSK) S.R.L. Vardenafil is a PDE5 inhibitor used for treating erectile dysfunction that is sold under the trade As of , the co-promotion rights of GSK on Levitra have been returned to Bayer in many markets outside the U.S. In Italy, Bayer sells vardenafil. FDA approves STAXYN™ (vardenafil HCl) orally disintegrating tablets for erectile dysfunction (ED). 18 June This press release is intended for.