Drug Dissolution Kinetics & Similarity Factor (f2) Calculator
Fit solid dosage release profiles using Weibull, Hixson-Crowell, and Higuchi models, and compute FDA similarity ($f_2$) and dissimilarity ($f_1$) factors for bioequivalence.
Dissolution Model Parameters
Time for 63.2% drug release
β=1: Exponential, β>1: Sigmoid
Drug Release & Bioequivalence Factor
Fraction Dissolved M(t)/M_∞
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FDA Similarity Factor (f₂)
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T₈₀% (80% Release)
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T₅₀% (50% Release)
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Dissimilarity f₁
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FDA / EMA Bioequivalence Standard
Two dissolution profiles are equivalent when f₂ ≥ 50 (f₁ ≤ 15).
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