Table 2.

List of model drugs used for preparation of matrix tablet

Drug Type	Solubility in water at 37°C (mg/mL)	Detection wave length (nm)
Caffeine anhydrous	37.0	273
Acetaminophen	18.9	242
Theophylline Anhydrous	9.9	271
Salicylic acid	3.1	297
Indomethacin	0.9	318

^a Phosphate buffer pH 7.2