Both these changes decrease your ability to focus, especially on near objects.

It can cause memory loss and decrease your ability to learn.

It might decrease your body's ability to fight off infection.

Or that would greatly decrease my ability to fight infection.

This decreases the body's ability to sweat and, therefore, cool down.

This medication can decrease your body's ability to fight an infection.

Less common side effects include headache, diarrhea, and decreased sexual ability.

The loss of clients decreased its ability to settle civil litigation.

This medication may decrease your ability to sweat, making you more likely to get heat stroke.

This medication can decrease your immune system's ability to fight infections.