Safe to drink after taking 400 mg of ibuprofen 8 hours ago?

At around 1pm I took some Ibuprofen because I woke up with a crazy hangover, stayed up until 5 celebrating the 4th of July. I can’t find anything concrete on whether or not it’s safe.

Note, I guess I am prone to stomach ulcers and gastritis. I had a really bad habit of drinking and then taking ibuprofen for the hangover the next day. It’s been near two months since then, today was the first time I’ve taken ibuprofen since those 2 months.