Warnings like that are serious and usually appear on medications that can increase the risk of dangerous side effects in some people.
Possible symptoms of a blood clot or heart problem can include:
- Sudden chest pain
- Trouble breathing
- Swelling, pain, or warmth in one leg
- Sudden weakness or numbness
- Severe headache or trouble speaking
If someone has symptoms like these after taking a medication, they should get urgent medical help right away.
If you want, you can tell me:
- the name of the tablets or medication
- where you saw the warning (box, ad, prescription label, etc.)
I can help explain what the warning means in simpler terms and what risks are commonly associated with that medicine.

