- Adequate liver function as evidenced by the following (assessed within 14 days of starting treatment): Total bilirubin must be within normal limits; aspartic transaminase (AST) and alanine transaminase (ALT) <= 2.5 x ULN with a normal alkaline phosphatases; alkaline phosphatases <= 4 x upper limit of normal with normal AST and ALT; patients with elevations of alk phos and AST and/or ALT will be excluded