Penicillin V Potassium Oral Tablets 125 mg, 250 mg, 500 mg; (Rx) Penicillin V Potassium Oral Powder for Suspension 125 mg/5 ml in 100 ml, 150 ml and 200 ml, 250 mg/5 ml in 100 ml, 150 ml and 200 ml; (Rx) There are a multitude of proprietary penicillin VK products, some more widely known include: