Because of the potential for drug‑drug interactions, use caution when prescribing AVODART to patients taking potent, chronic CYP3A4 enzyme inhibitors (e. Treatment should be continued as long as necessary until ferritin levels are within the normal range. Before taking the medication talk to your doctor if you are breastfeeding pastilla Viagra generico. Cyclosporin synthetase substrates include L- valine, L- leucine, L- alanine, glycine, 2-aminobutyric acid, 4-methyl threonine, and D-alanine, which is the starting amino acid in the biosynthetic process.