Section 4: Pharmaceutical Decomposition pathways & Stabilizers

Hydrolysis Mechanism — A degradative chemical pathway where a specific molecular bond is actively split via the addition of water.

Hydrolysis Vulnerable Target Groups — Esters and amides are structurally susceptible, classically compromising local anesthetics.

Hydrolysis Stabilization Strategies — Prevented using pH buffers, modifying the type of formulation solvent, or carrying out structural modification.

Oxidation Mechanism — A degradative chemical pathway characterized by the direct structural transfer of electrons.

Oxidation Vulnerable Target Groups — Highly prevalent among steroids, vitamins, and complex antibiotic structures.

Oxidation Stabilization Strategies — Controlled by maintaining low oxygen content, adding antioxidants, using pH buffers, or changing solvent type.

Photolysis Mechanism — A degradative pathway driven by the direct molecular absorption of radiant energy in the form of light.

Photolysis Vulnerable Target Drugs — Classically damages Nifedipine and Hydrocortisone structures.

Photolysis Stabilization Strategies — Controlled by modifying storage conditions and packaging drugs within light-resistant containers.

True Antioxidants Definition — Exert stabilization by serving as highly effective free radical scavengers to block chain propagation.

True Antioxidant Chemical Examples — Comprises Tocopherol (Vitamin E), Butylated Hydroxyanisole (BHA), Butylated Hydroxytoluene (BHT), and alkyl gallates.

Reducing Agents Mechanism — Stabilize formulations by functioning as sacrificial targets that preferentially get oxidized themselves.

Reducing Agent Chemical Examples — Comprises Ascorbic Acid (Vitamin C) and sulfites.

Antioxidant Synergists Definition — Compounds that lack inherent antioxidant activity but drastically boost the performance of true antioxidants.

Antioxidant Synergist Mechanisms — Function by chelating trace metals that would otherwise catalyze destructive oxidation reactions.

Antioxidant Synergist Examples — Comprises EDTA, citric acid, tartaric acid, citraconic acid, and phosphoric acid.