Step one: stop what you are doing or sit down and rest.
Step two: take your GTN spray and tablets, according to your doctor or nurse’s instructions. The pain should ease within a few minutes – if it doesn’t, take a second dose.
Step three: if the pain does not ease within a few minutes after your second dose, call 999 immediately.
Step four: if you’re not allergic to aspirin and there’s one easily available, chew an adult tablet (300mg). If you don’t have an aspirin next to you or you’re not sure if you’re allergic to aspirin, rest until the ambulance arrives.
Even if your symptoms don’t match the ones above but you think you’re having a heart attack, call 999 immediately.