several samples after we had bought a prescription. The samples are white in an irregular oblong shape with 503 on one side & 2 MG on the other. The ones we had filled were round & blue with an M on one side & G2 on the other. I just want to make sure they were the same medication. She has ADHD & the doctor is trying this along with Serroquel. She is to increase the Intuniv until a dosage of 4 mg daily. Thank you for your help.