Many women rely on tampons during their menstrual cycle, but there is some debate over whether or not they can cause blocked drains. Tampons are made of absorbent materials such as cotton and rayon, which swell when wet and can potentially block drains. However, most tampons are designed to break down quickly in water, and they are typically only used for a few hours at a time.
As a result, it is unlikely that tampons will cause significant drain blockages. If you are concerned about your tampons causing problems, you can flush them down the toilet or dispose of them in a sealed bag. In general, however, tampons are not likely to cause major drain problems.