A medical assistant should look for reliable information on medications in trusted and authoritative sources such as:

• The Physician's Desk Reference (PDR), which offers comprehensive prescription drug information including indications, dosages, and side effects.
• The American Hospital Formulary Service (AHFS) for detailed drug information widely used in hospitals.
• Reputable online databases like MedlinePlus, UpToDate, and Drugs.com that provide current, evidence-based drug information.
• Manufacturer's package inserts for specific drug labeling and usage details.
• Government sites like DailyMed (FDA's official provider of drug labeling), the U.S. National Library of Medicine resources, and the FDA's drug database.
• Professional references such as the British National Formulary (UK context) and similar recognized formularies.

Consulting pharmacists and healthcare professionals is also advisable for clarification and personalized guidance. These sources ensure accurate, up-to- date, and trustworthy medication information is accessed when needed by a medical assistant.