Recommended dosage for Ansaid (Flurbiprofen)

I sometimes have to use pain killers because of severe headaches that use to have. They are not like migraine attacks and almost always respond to common analgesics. Last time when I had very bad headache attack I took ansaid. I had gastric discomfort after that tablet. Please tell me what is the recommended dosage for ansaid (flurbiprofen)?

The largest recommended single dose of flurbiprofen is 100mg, when drug is taken in multiple dose daily regimen. Ansaid is available in 50mg and 100mg tablets. As it is used to give relief in rheumatoid arthritis and osteoarthritis, doses that are usually prescribed are 200-300mg per day, divided in 2, 3 or 4 times a day. I also sometimes use ansaid to relieve severe headache and one 100mg tablet really gives me expected relief.