It is not known why the drugs cause problems, if they do.

It's not at all clear that the drugs actually cause these behavior changes.

We will never know which drug or drugs caused the problems.

This drug can cause a drop in blood pressure, especially within the first hour after use.

Even if one drug caused someone else to lose weight, the same might not be true for you.

Officials at the American drug agency have said there is little evidence that the drugs cause heart problems.

This drug may cause your skin to be more sensitive to the sun.

These drugs can cause severe side effects but are used in special cases.

Taken together, certain drugs can cause serious harm, if not death.

This is when alcohol or drugs cause problems in your life.