What to do before and after classic bypass ( Roux-en-Y) operation?
Before the operation:
Talk to your surgeon about all the medications you take. You may need to stop certain medications before the procedure.
Follow a healthy diet to get used to it.
Do not smoke. Smoking increases the risk of surgical complications.
exercise. Improve your general health with regular exercise.
Have reasonable and realistic expectations of action.
 

after surgery:
Follow your doctor's instructions about diet, medications, and exercise carefully.
Ask your surgeon and support team if you have any questions or concerns.
Considering that you are on a new diet after the operation, it will take some time to get used to this diet. So try to start your work activities gradually.
Avoid solid foods, carbonated drinks, alcohol and caffeine. To read more about alcohol consumption, go to the article Gastric bypass and alcohol consumption.
See your doctor regularly to check your condition and progress.
 

What medicines should you not take before classic bypass?
Anticoagulants such as warfarin or aspirin 
Non-steroidal anti-inflammatory drugs such as ibuprofen or naproxen
Certain anticonvulsants
Certain blood pressure medications
Certain diabetes medications
Certain heart medications (with the permission of the cardiologist)