The price gap of Tyrenol ER, Gelfos and Tak-Sen widened up to 150 percent among different pharmacies selling the drugs, which contrasted against high-priced bundle-packaged drugs showing barely any gap.

Daily Pharm surveyed 22 pharmacies in Incheon for their frequently sold over-the-counter (OTC) drug retail prices as of February, and it found Tyrenol ER Tablet (6 tablets per package) is sold at maximum 2,500 won and minimum 1,600 won showing around 156 percent, or 900 won difference in prices. The average price for the product is 2,176 won.

Gelfos M Suspension (4 packets per package) is sold at maximum 4,500 won and minimum 3,000 won, which also showed about 150 percent, or 1,500 won dif