This morning I took 5 drops on an empty stomach and went to work. Drank 18 ounces of coffee. Then about a couple hours later my vision was effected. It was as though someone had shined a bright light in my eyes and I couldn't see very well because my eyes were adjusted to the bright light. Then later I had a slight headache, a little trouble talking and a expereienced a slight bit of nausea.
After I had lunch I was fine.
Because it wasn't that big of a deal, I think I'll just continue with the 5 drops until it has no effects at all for a couple of doses. Instead of cutting back.