Thanks for writing your query.
As you had mentioned that you had developed heart flutter & dyspnea
after taking Minocin
. Minocin can cause this type of side effects if taken. Good that you have stopped taking the medicine.
But it is unlikely that such symptoms can persist even after couple of weeks after stopping medicine. I would advise you next time if you develop this heart flutter or breathless , kindly get your electrocardiogram done from nearest health care center when you develop any symptoms.
Also when you visit any doctor in future kindly tell your doctor that you had developed this symptoms when you had taken Minocin tablet so that your doctor will not prescribe you the same medicine again
Wish you Good Health.