Question

what is the main difference between prescription (rx) and over - the - counter (otc) medicines? a. rx is a medicine that reduces or kill harmful bacteria in the body. otc is a preparation of dead or weakened pathogens that is introduced into the body to cause an immune response. b. rx is the diminishing effect with regular use of the same dose of a drug. otc is using a medicine in ways other than the intended use. c. rx are medicines that can be sold only with a written order from a physician. otc is any medicine that can be bought without a prescription. d. rx is intentionally taking medicines for non - medical reasons. otc is using a medicine in ways other than the intended use.

Explanation:

Prescription (Rx) medicines require a written order from a physician and can only be sold with it, while over - the - counter (OTC) medicines can be bought without a prescription. This is the key difference.

Answer:

C. Rx are medicines that can be sold only with a written order from a physician. OTC is any medicine that can be bought without a prescription.