Overview
Coated capsules are advanced pharmaceutical dosage forms where gelatin or vegetarian capsules are coated with polymers like hypromellose (HPMC) or cellulose acetate phthalate. The coating serves multiple purposes: protecting active ingredients from gastric acid (enteric coatings), masking bitter tastes, or enabling timed release. They are particularly valuable for hygroscopic or pH-sensitive drugs. In B2B settings, manufacturers typically supply pre-coated empty capsules or offer contract coating services for filled capsules. The technology aligns with modern drug delivery trends, combining the convenience of capsules with the precision of coated tablets.
Physical and Chemical Properties
The core capsule material is usually gelatin (from animal sources) or HPMC (vegetarian), while coatings range from pH-dependent polymers (e.g., Eudragit® for enteric release) to moisture-barrier materials like shellac. Coating thickness typically ranges from 20-100 μm, adding minimal weight (3-8% of total capsule mass). Key performance metrics include disintegration time (delayed by 15-60 minutes for enteric coatings) and dissolution profile (meeting USP <711> standards). Coatings must maintain flexibility to prevent cracking during handling while resisting capsule adhesion in blister packs.
Main Applications
Enteric-coated capsules dominate the market (60% of applications), protecting drugs like omeprazole from stomach acid or preventing gastric irritation from NSAIDs. Probiotics also utilize enteric coatings to bypass stomach acidity. Taste-masked coatings are essential for pediatric and geriatric medications with bitter APIs like antibiotics. In niche applications, specialized coatings enable colonic delivery (e.g., for IBD treatments) or sequential release in multi-particulate systems. The nutraceutical industry employs coatings to stabilize oxygen-sensitive ingredients like fish oils.
Safety and Storage
Regulatory compliance is critical – coatings must use FDA/EMA-approved excipients (e.g., Eudragit® L30D-55 for enteric use). Gelatin capsules require strict humidity control (35-65% RH) to prevent brittleness or softening, while HPMC capsules are more forgiving. Batch documentation should include residual solvent testing (for solvent-based coatings). Storage recommendations vary by coating type: moisture-barrier coatings demand desiccants, while enteric coatings may need protection from alkaline environments. Shelf life typically ranges from 2-3 years when stored properly.
B2B Procurement Guide
When sourcing coated capsules, prioritize suppliers with ISO 15378 certification for primary packaging materials. Key specifications to confirm: coating uniformity (measured by weight variation <5%), dissolution performance (per USP/EP methods), and metal impurity levels (for regulatory filings). For custom projects, provide detailed requirements: target release pH (e.g., 5.5 for intestinal delivery), desired dissolution profile, and compatibility data with your API. Bulk pricing breaks occur at 100K+ unit orders, with lead times of 8-12 weeks for specialized coatings.
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