Polymorphic Forms of Lamivudine: Characterization, Estimation of Transition Temperature, and Stability Studies by Thermodynamic and Spectroscopic Studies

Table 2

Thermal characteristics of Form I, Form II, Form II_H, Form III_L, and Form III_H of lamivudine by differential scanning calorimetry.

Sample	Melting temperature; (°C)	Enthalpy of fusion; (J/g)
Form IL	117.5	19.6
Form IH	178.2	109.9
Form II	178.6	90.9
Form IIIL	114.3	13.9
Form IIIH	173.8	43.7