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  1. Drugs & Medications A to Z - Drugs.com

  2. Drug Classification & Categories | Drugs.com

  3. WebMD's A to Z Drug Database

  4. Drugs and Medications A-Z - Healthline

  5. Drug Classes and Medication Classification - Verywell Health

  6. Drug Classes: Browse Medications by Classification - GoodRx

  7. General Drug Categories | FDA - U.S. Food and Drug Administration

  8. Over-the-Counter (OTC) Medications - Drugs.com

  9. Medicines - MedlinePlus

  10. The 10 Types of Drugs and Their Characteristics - Muy Salud