Drugs given for suspected MI, how long will they last?

Hi if your doctor is not stopping these drugs then always carry on taking them, the drugs you are taking will be maintaining your sinus rhythm by affecting the 'electrical cycle' of your heart. If the doctor has stopped them then on average the drugs will take around 1-3 days depending on type of drug to no longer have effects. Te problems would not necessarily return immediately if you are not always in an arrhythmia but by not taking the drugs you increase that risk greatly