We often just assume that the drugs we’re taking are good for us. Our doctor told us to take them, right? It's smart to follow what your doctor tells you to do because he knows about your health better than anyone else. Unfortunately, that doesn’t mean that the drug you’re taking is good for you in the long run. There’s a lot of reasons why you should at least ask your doctor questions about what you’re prescribed. Many doctors prescribe medications that are designed to be short-term, and a person that's taking them long term can cause issues. Sometimes, you should ask for a different type of medication than the one they initially suggested.Remember, the world of science is always changing. There are always tests being done and redone. We might realize tomorrow that what we consider good for us today may not be good for us in the long-run. For example, everybody used to smoke cigarettes. Now, we know that the little roll of tobacco is extremely dangerous for us. Our doctors do their best to stay on top of this research, but sometimes, there is a lot of contradicting answers; other times, there's just too much for them to process.Even those studies aren't always accurate. Pharmaceutical companies that just want to make money off of you buying their medication for all of your foreseeable future often sponsor studies. These studies can’t always be trusted to be unbiased. After all, they did sponsor the studies that said opioids are good for us, yet we’re now facing an opioid overdose epidemic. Suffice it to say, there’s a lot of digging that needs to be done if you want to take any medication for an extended period of time. These are 20 medications we’ve found that could be dangerous for you.