It's perfectly OK to empty your supplement capsules into your chosen drink of the day. I would tell your doctor and your pharmacist of your allergy so they can possibly give you medication that is not in beef gelatin capsules. You could even call the companies that make your supplements and ask if they have alternative types of capsules.
Hello~Certain drugs will say not to, but if they don't, or if they are vitamins, herbs or minerals, I don't see any reason not to. I use to do it with all my vitamins due to food allergies, you see, most of the capsules are made from beef gelatin, I was allergic to beef, so I opened them up and put the contents in orange juice, it didn't taste too great, but it was the way for me to get my vitamins.