Define impurities and contaminants in the context of pharmaceuticals. What are the common sources of impurities in pharmaceutical products?

a)
Impurities in pharmaceuticals are any foreign substances present in a drug product or active pharmaceutical ingredient (API) that are not the drug substance itself or an excipient. They can affect the safety, efficacy, and quality of the product.
Contaminants are unwanted substances that are introduced into a pharmaceutical product during manufacturing, storage, or handling. These can include microorganisms, dust, fibers, or residues from cleaning agents.

c)
Various sources of impurities in pharmaceuticals include:

• Raw materials: Impurities present in starting materials, reagents, or solvents.
• Manufacturing process: By-products formed during synthesis, degradation products, or residues from catalysts.
• Packaging materials: Leaching of substances from containers or closures.
• Storage conditions: Degradation due to light, heat, moisture, or interaction with the environment.
• Cross-contamination: Transfer of material from one product to another during manufacturing.
• Microbial contamination: Presence of bacteria, fungi, or their toxins.