If you take omeprazole at night, and it has to be on empty stomach, how long after eating show you wait to take it? it lasts 24 hours?

Acid Awareness: Omeprazole, like other proton pump inhibitors which reduce acid production, is advised to be taken on an empty stomach. This is to improve absorption by the body during a time when acid secretion is actually not desired, i.e. Sleep. Taking it 90 to 150 minutes after a large or fatty meal would be ideal. Eating within three hours of bedtime is never advisable on acid suppression therapy.

2-4 hours after a: Meal or snack.

Omeprazole: Ideally you should take Omeprazole before meals in the morning, and same applies to in the evening, but if you want to take after meal i would recommend wait three hours after meal, but if you have to go to bed before you can take at bed tim, it will still work.