Overview
Pirfenidone is a small molecule drug first approved in Japan (2008) and later in the US (2014) for treating idiopathic pulmonary fibrosis (IPF), a progressive lung disease. As a pyridone derivative, it exhibits both anti-fibrotic and anti-inflammatory properties through multiple pathways including TGF-β suppression and TNF-α modulation. The drug has shown significant clinical benefits in slowing forced vital capacity (FVC) decline in IPF patients. Originally developed by Marnac Inc., pirfenidone is now marketed globally under various brand names including Esbriet (Genentech) and Pirfenex (Cipla). Its molecular structure features a phenyl group attached to a pyridone ring, contributing to its pharmacokinetic properties with 80-90% oral bioavailability and hepatic metabolism via CYP1A2 enzymes.
Physical and Chemical Properties
Pirfenidone exists as a crystalline solid with moderate solubility in organic solvents but limited water solubility (approximately 1.6 mg/mL at 25°C). The compound demonstrates stability under standard storage conditions but degrades upon prolonged exposure to UV light, necessitating amber glass containers. Its logP value of 2.16 indicates adequate lipophilicity for membrane penetration. Thermal analysis shows decomposition above 200°C without sharp melting transition. The molecule's hydrogen bond acceptor/donor counts (2/0) and polar surface area (30.7 Ų) comply with Lipinski's rule of five, supporting its drug-like properties. pH-dependent solubility studies reveal improved dissolution in acidic environments, influencing formulation strategies for oral delivery.
Main Applications
The primary clinical application of pirfenidone is the treatment of mild-to-moderate idiopathic pulmonary fibrosis (IPF), where it reduces disease progression by approximately 30% in clinical trials. The drug's mechanism involves downregulation of profibrotic cytokines (TGF-β, PDGF) and inhibition of collagen deposition, preserving lung function. Emerging off-label uses include treatment of other fibrotic disorders such as liver cirrhosis, renal fibrosis, and cardiac fibrosis. Research suggests efficacy in radiation-induced fibrosis and scleroderma-related conditions. In vitro studies demonstrate anti-proliferative effects on fibroblasts at concentrations of 100-500 μg/mL, with ongoing investigations into combination therapies with nintedanib for enhanced efficacy.
Safety and Storage
Pirfenidone requires careful handling due to its photosensitizing properties - protective packaging and storage in darkness are essential. The bulk chemical should be kept at controlled room temperature (15-30°C) with desiccants to prevent moisture absorption. Occupational exposure limits follow general pharmaceutical powder guidelines (1 mg/m³ TWA). Clinical formulations carry warnings for hepatotoxicity (requiring liver enzyme monitoring), gastrointestinal disturbances (30% incidence), and photosensitivity reactions (sunscreen recommended). Drug-drug interactions occur with CYP1A2 inhibitors (e.g., fluvoxamine) requiring dose adjustments. Spill management involves PPE-equipped personnel using absorbent materials, with disposal as pharmaceutical waste.
B2B Procurement Guide
Pharmaceutical manufacturers sourcing pirfenidone should prioritize suppliers with: 1) Current Good Manufacturing Practice (cGMP) certification, 2) Detailed Certificate of Analysis including HPLC purity (>99.5%), 3) DMF/ASMF registration status for regulatory compliance. Bulk quantities (25kg drums) typically offer 10-15% cost savings versus smaller research quantities. Key quality parameters include residual solvent levels (ICH Q3C compliance), polymorphic form verification (Form I preferred), and microbiological testing. Lead times average 4-6 weeks for API orders, with container options including double polyethylene bags within fiber drums. Emerging Asian producers offer competitive pricing but require thorough audit of facility qualifications and stability data packages.
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