Once the horse has recovered and is eating better, you can switch from the paste to the powder or liquid version. The liquid and powder versions can also be used as daily preventive measures for horses prone to stomach ulcers. Unlike omeprazole, it does not shut down stomach acid production, but works to protect the stomach from acid damage. Recommended use of Gastro Aid Paste: Administer 2 syringes (120 g) per day over 6 days, followed by 1 syringe (60 g) per day over 6 days.