I don't think enox is that important to Amphastar's bottom line. It seems they already have a line of drugs making them dough:
Amphastar Pharmaceuticals wants to help drugs help themselves. A maker of injectable and inhalant drugs and drug delivery systems, the company focuses on drugs that are difficult to manufacture or can be improved with new delivery systems. Amphastar's products include Amphadase (increases absorption and dispersion of injected drugs), Cortrosyn (tests for adrenal gland disorders), and Naloxone (reverses the effects of opioids like painkillers and other narcotics). It also manufactures the branded asthma drug Primatene Mist, which is sold over the counter. Founded in 1996, Amphastar manufactures and develops many of its products through its subsidiaries Armstrong Pharmaceuticals and International Medication.
The company's Massachusetts-based Armstrong Pharmaceuticals subsidiary focuses on manufacturing metered dose inhalers used to administer respiratory drugs for asthma and obstructive pulmonary disease. Its California-based International Medication systems subsidiary, on the other hand, makes pre-filled syringes and vials that are filled with injectable and topical drugs. Its products range from Vitamin K administered to newborn babies to lidocaine used in emergency medicine (Lidocaine is a topical local anesthetic that can be applied internally to the larynx/trachea, urinary tract, and other areas.).
While it focuses on developing and marketing its own pipeline of products, Amphastar does, from time to time, partner with other drug makers through both in-licensing and out-licensing agreements. In addition, the company also offers contract manufacturing services that include labeling and packaging, cold storage, and aseptic filling.