European Pharmacopoeia -ph. Eur.- Monograph Tablets -0478- · Authentic

| Test | Ph. Eur. Reference | When required | Common Pitfall | |------|--------------------|---------------|----------------| | Appearance | Visual inspection | Always | Overlooking color variation from batch to batch | | Identification A+B | As per monograph | Always | Using same HPLC condition for assay and ID (not allowed unless specified) | | Uniformity of mass | 2.9.5 | If active ≥ 50% w/w or ≥ 25 mg per unit | Not performing it on 20 tablets individually | | Uniformity of content | 2.9.6 | If active < 50% w/w or < 2 mg per unit | Applying mass method incorrectly to low-dose tablets | | Dissolution | 2.9.3 | Default for immediate-release | Using wrong apparatus (paddle vs basket) without justification | | Disintegration | 2.9.1 | Only if monograph permits | Forgetting time limit (e.g., 15 min for uncoated) | | Friability | 2.9.7 | Only if in specification | Testing hygroscopic tablets at ambient humidity |

For many tablets, disintegration is not enough; the drug must dissolve to be absorbed. Dissolution testing measures the rate and extent of drug release into a medium under controlled conditions (apparatus 1: Basket, or apparatus 2: Paddle). European Pharmacopoeia -ph. Eur.- Monograph Tablets -0478-

To ensure seamless passage of a Ph. Eur. audit (e.g., by a European OMCL – Official Medicines Control Laboratory), follow these protocols: | Test | Ph

While the global industry tries to harmonize via the ICH Q4B process, differences remain. While the global industry tries to harmonize via

| Parameter | Ph. Eur. 0478 | USP <701>/<711> | JP (General Tests) | | :--- | :--- | :--- | :--- | | Disintegration time (uncoated) | 15 min | 15 min (but often 30 min for large tabs) | 15 min | | Dissolution vessel volume | 900 mL (preferred) | 500, 900, or 1000 mL | 900 mL | | Friability acceptance | 1.0% (uncoated) | 1.0% (but 0.8% for high-use) | 1.0% | | Uniformity of dosage units | AV ≤ 15.0 (2.9.40) | AV ≤ 15.0 (identical via ICH Q4B) | AV ≤ 15.0 |

Critical difference: Ph. Eur. 0478 allows a "re-test" for disintegration (repeat on 6 new tablets) if 1-2 of the first 6 fail. USP <701> requires that if 1-2 fail, you test 12 more; if more than 2 fail initially, rejection is immediate.