 Some serious side effects of long term administration included sustained ventricular tachycardia resulting in circulatory collapse, worsening myocardial ischemia, acute myocardial infarction, and worsening congestive heart failure.Amrinone has good absorption from the gastrointestinal tract  and may lead to some gastrointestinal upset when taken orally.The oral form of the drug is no longer in use.