Expired prescription medicine

Patient: If a medication is expired. Is it safe to take it. A friend of mine took half of Apo-Ibuprofen 600mg for his low back pain because nothing work for his pain so far. The expiry date was Nov. 11. 2009. I’m monitoring him right now. Please let me know how’s this gonna affect him and what are the signs that I need to watch out for.Thanks Docs.

Symptoms: Coughing