A = antes
DE = desayuno (breakfast)
CO = comida (lunch)
CEN = cena (supper)

I now need to find some references as I don't know how this is expressed in English

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Note added at 46 mins (2023-05-11 17:18:00 GMT)
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https://forum.wordreference.com/threads/decoce-sp-or.2933122...

¿Cómo tomar omeprazol y cuál es la dosis?
La dosis habitual es de una cápsula diaria. Normalmente se aconseja tomarlo por la mañana y, a ser posible, alrededor de 30 minutos antes del desayuno. Es importante tragar las cápsulas enteras, sin masticar ni machacar su contenido.

https://cuidateplus.marca.com/medicamentos/2022/10/29/omepra...

It is generally recommended that you take omeprazole at least one hour before eating a meal, as this allows the medication to be fully absorbed into the body before food passes through the stomach. However, it is also considered safe to take omeprazole immediately after eating, as the drug will still be effective as long as it is taken at least one hour before the next meal.

https://www.thedonutwhole.com/how-long-after-eating-can-you-...

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Note added at 47 mins (2023-05-11 17:19:12 GMT)
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Metoclopramide comes as a tablet, an orally disintegrating (dissolving) tablet, and a solution (liquid) to take by mouth. It is usually taken 4 times a day on an empty stomach, 30 minutes before each meal and at bedtime.

https://medlineplus.gov/druginfo/meds/a684035.html#:~:text=M...