RDY 20 Pill - yellow oval, 13mm Pill with imprint RDY 20 is Yellow, Oval and has been identified as Tadalafil 20 mg. It is supplied by Dr. Reddy's Laboratories, Inc.Tadalafil is used in the treatment of Erectile Dysfunction; Benign Prostatic Hyperplasia; Pulmonary Arterial Hypertension and ...