Tadalafil is a selective, reversible inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5), supplied as a high-purity Active Pharmaceutical Ingredient (API) synthesized under stringent current Good Manufacturing Practice (cGMP) standards for industrial pharmaceutical formulation.

Key Specifications

Parameter	Specification Standard	Analytical Method / Reference
Assay (Dried Basis)	98.0% to 102.0%	HPLC (USP/EP Monograph)
Individual Impurity	Max 0.10%	ICH Q3A Compliant HPLC
Total Impurities	Max 0.50%	ICH Q3A Compliant HPLC
Residual Solvents	Class 3 only (Max 5000 ppm); Class 1 and 2 absent	Headspace GC (ICH Q3C)
Particle Size (D90)	15 micrometers to 45 micrometers	Laser Diffraction (Malvern)
Crystalline Polymorph	Form A confirmed	XRPD and DSC Verification
Heavy Metals	Max 10 ppm (Catalyst residues compliant)	ICP-MS (ICH Q3D)

Chemical & Functional Profile

Molecular Structure: C22H19N3O4 with a molecular weight of 389.41 g/mol.

Solubility Properties: Practically insoluble in water, slightly soluble in ethanol, freely soluble in DMSO and dichloromethane.

Thermal Stability: Sharp melting range between 301°C and 303°C, verifying high crystalline integrity without thermal degradation.

Solid-State Behavior: Non-hygroscopic under standard climatic storage (25°C / 60% relative humidity), preventing moisture-induced agglomeration.

Product-Specific Technical Focus

Crystallization Kinetics: Nucleation parameters engineered to eliminate polymorphic shifts and ensure absolute batch-to-batch crystal habit consistency.

Chiral Integrity: Single-isomer delivery verified via chiral HPLC, preventing active racemate contamination.

Elemental Control: ICP-MS screening confirms catalyst residues (Palladium, Platinum) remain well below regulatory thresholds.

Dissolution Profiling: Controlled specific surface area matches reference listed drug release profiles.

Formulation & Development Considerations

Excipient Compatibility: Demonstrates chemical stability with lactose monohydrate, microcrystalline cellulose, croscarmellose sodium, and magnesium stearate.

Powder Flowability: Carr index of 15% to 22% and Hausner ratio of 1.18 to 1.28 ensure uniform feeding in high-speed rotary tablet presses.

Bulk Density: Maintained between 0.45 g/cm3 and 0.65 g/cm3 for consistent volumetric dosing from pilot to commercial scale.

Typical Applications

Oral Solid Dosage: Industrial manufacture of film-coated tablets in 2.5 mg, 5 mg, 10 mg, and 20 mg strengths.

Combination Therapies: Fixed-dose development targeting benign prostatic hyperplasia and erectile dysfunction treatments.

Generic Pipeline: Reference material for bio-comparative studies, stress testing, and ANDA submissions.

Quality Control & Analytical Validation

Method Validation: All testing procedures validated in accordance with ICH Q2(R1) guidelines.

Microbiological Limits: Total aerobic microbial count less than 10^2 CFU/g; total yeasts and molds less than 10^1 CFU/g; absent of E. coli and Salmonella.

Genealogy Traceability: Complete batch records maintained from starting material synthesis to final powder blending.

Deviation Protocol: Strict quarantine and root-cause investigation workflows for any out-of-specification event.

Documentation & Regulatory Support

Comprehensive Dossiers: Complete technical data packages available including Certificates of Analysis (COA) representing registration, pilot, and commercial validation batches.

Safety Documentation: Material Safety Data Sheets (MSDS) fully compliant with the latest GHS standards.

Analytical Standards: Product Specifications (TDS), Method of Analysis (MOA), and Route of Synthesis (ROS) provided for technical evaluation.

Regulatory Declarations: Validated BSE/TSE-Free Certificates, Non-GMO Declarations, and Allergen Statements.

DMF & CEP Support: Drug Master File (DMF) or Certificate of Suitability (CEP) coordination for core strategic APIs maintained in highly regulated territories including US FDA, European EMA, and Japanese PMDA frameworks.

Storage Conditions

Thermal Control: Store between 15°C and 25°C, with permitted excursions up to 30°C per USP controlled room temperature guidelines.

Environmental Protection: Shield from direct ultraviolet radiation, intense light, and ambient atmospheric moisture.

Container Sealing: Keep tightly closed in original double polyethylene liners inside fiber drums to block gas permeation.

Packaging and Logistics

Primary Packaging: Food-grade, double-layer LDPE bags heat-sealed under vacuum.

Secondary Packaging: Tamper-evident fiber drums fitted with steel locking rings and internal desiccant sachets.

Standard Quantities: 1 kg, 5 kg, and 25 kg net weight configurations available.

Transit Protection: Opaque, moisture-resistant outer shielding deployed for temperature-monitored air and ocean freight.

Frequently Asked Questions

Q: What is the established retest period?

A: 36 months from the date of manufacture when stored in unopened original packaging under recommended conditions.

Q: Is an open/closed part DMF accessible for regulatory filing?

A: Yes, a comprehensive Type II DMF is active to support customer abbreviated new drug applications.

Q: Does the synthesis utilize animal-derived starting materials?

A: No, the manufacturing route relies entirely on synthetic, non-animal-derived starting materials, eliminating TSE risks.

Q: Can particle size be adjusted for direct compression?

A: Yes, jet-milling parameters can be customized during secondary processing to meet specific D90 targets.

Q: What analytical instruments are used for impurity profiling?

A: High-performance liquid chromatography coupled with photodiode array detection and liquid chromatography-mass spectrometry.

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