What is this S-modafinil, R-Modafinil stuff? Questions and Answers › Category: Questions › What is this S-modafinil, R-Modafinil stuff? 0 Vote Up Vote Down Anonymous asked 6 years ago So im aware of the Modalert, Modvigil, Artvigil?, Waklert? But what is the S-modafinil, R-modafinil stuff? If i am correct R-modafinil is very strong and it is the Artvigil?