The symptoms you are experiencing, such as dizziness, spinning sensation, discomfort, and tiredness, can occur with this medicine because it reduces heart rate and blood pressure, and these effects may be more noticeable after a recent heart stent procedure. These symptoms do not always mean the medicine is harmful, but they should not be ignored. Do not stop or adjust the medicine on your own. It is essential to consult your cardiologist to assess your blood pressure, heart rate, and overall recovery, and to decide whether any change in treatment is needed.

Sudden dizziness can occur for many reasons. Common causes include dehydration, low blood pressure, low blood sugar, anaemia, inner ear disorders (such as benign paroxysmal positional vertigo or labyrinthitis), anxiety, or side effects of certain medications. It may feel like lightheadedness, faintness, or vertigo (a spinning sensation). While occasional dizziness is often harmless, recurrent, severe, or persistent episodes should be evaluated by a doctor to rule out more serious conditions such as heart problems, neurological disorders, or chronic ear disease.

A prolonged fast heartbeat after exercise can indicate a condition like tachycardia or an arrhythmia (an irregular heart rhythm). Met XL 50 contains Metoprolol Succinate, a medication known as a beta-blocker. It works by blocking the effects of adrenaline on the heart, which helps slow down the heart rate, lower blood pressure, and reduce the overall workload on the heart. It is commonly prescribed to manage rapid heart rates, high blood pressure, and to prevent chest pain. Your father should take this medicine exactly as prescribed and follow up with his doctor for any necessary cardiac evaluations.