Absolutely, Zantac is more for acid reflux right? Probiotics are great for putting healthy bacteria into your digestive system. VSL#3 is By prescription, but works great. :)
Yup, you can take them. And if your doc is up-to-date, he should jump for joy that you're being proactive. The only time probiotics are contraindicated is if you're immunosuppressed or if you have a condition such as pancreatitis or bile duct reflux.
Welcome to the gastroenterology community! Most likely the answer is yes, but I would recommend checking with your doctor about this.