The difference is the dosages. OTC is 75mg and 150 mg; Rx is 300 mg. You can always check with your pharmacist as well.
Hi...my DH asked out pharmacist and most times it may be that it is a different dosage..so if u take 1 pill every AM...u may need to take 2...but talk to ur pharmacist as they are the best to tell u what is comparable an suggest what u should take.
"selma"