Abortives are medicines and therapies that can stop or shorten an attack once it has begun. Abortive therapies are intended to do just that – abort the attack at its onset and stop the pain. One of the most critical factors in effectively aborting a cluster headache is getting the medicine to the problem, fast. Since cluster headaches come on rapidly and are of relatively short duration, medicines taken in pill form are generally not effective. The route of administration of the drug should introduce the medicine to the bloodstream fairly immediately, therefore, medicine by injection or inhalation will provide the highest likelihood of an effective and rapid abort.