This is-but-isn't a medication, but I started getting visual migraines about 10 years ago. They come on suddenly with no warning.

I did a "Dr Google" search and found some information on instant coffee and migraines or visual migraines which was very interesting. The accepted belief is that drinking coffee can bring on migraines, but many of these websites were saying that, in fact, it is not the coffee which brings them on, but when the effect of the coffee wears off after a couple of hours.

I experimented on my visual migraines. Instant coffee works a treat, within a very short time. Normally, I only have two cups of brewed coffee a day so an extra cup of instant coffee is not excessive.

I try not to take lots of medications if I can help it, so the only time I take ibuprofen is if the visual migraine comes on suddenly and fast. Then I have a cup of instant coffee and an ibuprofen. If it comes on slowly, I just take the coffee. It usually works.