Switching a drug from prescription to over-the-counter status also typically causes its price to fall. For instance, the price of a day’s supply of the heartburn medication omeprazole fell nearly by half, from almost $4.20 to $2.35. The price of the antihistamine loratadine also fell by half, to just $1 per pill. Prices for drugs that become available over the counter often fall below what many insured patients had been paying in copays.