Pradaxa 150 mg is a medication used to prevent blood clots and reduce the risk of stroke, especially in conditions like atrial fibrillation. Since you took it two years ago and are not currently on it, the medication itself is unlikely related to your current headache.

However, a severe headache on one side of the head can have many causes, some of which may require prompt medical attention. It is important to consult a doctor to evaluate your symptoms properly.

Key points to consider:

• Pradaxa 150 mg: An anticoagulant (blood thinner) used to prevent strokes and clots.
• Current symptoms: Severe one-sided headache needs medical evaluation.
• Medication history: Stopping Pradaxa two years ago generally does not cause headaches now.

Please seek medical advice promptly to determine the cause of your headache and receive appropriate care. If you experience additional symptoms like vision changes, weakness, confusion, or difficulty speaking, seek emergency care immediately.

For urgent assistance, you can contact Apollo Emergency at 1066.To narrow down potential causes, we will need some more information.Please tell me your age and gender.