Amphetamines can affect the cardiovascular system and cause angina, hypertension, arrhythmias, syncope and maculopathy. Myocardial infarction and cardiomyopathy would be the dangerous side effects of amphetamines which can arise at high doses. Methylphenidate (or methylphenidylacetate hydrochloride): a stimulant present in specified brand name drugs such as: Ritalin Call an ambulance https://fyodorp209tmg1.wikitelevisions.com/user