After angiography, the duration of taking Clopitab (clopidogrel) depends on your condition. If no stent was placed, it may be needed for a shorter period, but if a stent was inserted, it is usually continued for at least 6-12 months or sometimes longer to prevent clot formation. The exact duration is decided by your doctor based on your heart condition and risk factors, so you should not stop it on your own. Alternatives like Ticagrelor or Prasugrel may be used in some cases, but they are not suitable for everyone and must only be taken if prescribed by your doctor. It is best to continue your current medicine as advised and discuss with your doctor before making any changes to ensure your safety.