Amoxicillin is available as a generic medication. Propranolol is available as a generic medication. Tamoxifen is available as a generic medication. Methotrexate is available as a generic medication. Warfarin is available as a generic medication. It is available as a generic medication. Salbutamol is available as a generic medication. Vancomycin is available as a generic medication. Naloxone is available as a generic medication. A number of generic versions are available.