GASTROZOL | Best Omeprazole Paste for Horse Gastric Ulcer Treatment GASTROZOL is the ideal medicine for horse gastric ulcers. This easy-to-use omeprazole paste—a type of medication that reduces stomach acid—stops stomach pain and heals ulcers quickly. Suitable for racehorses and even foals from 1 month old. Help your horse eat better and perform at their bes...