The heartworm medicine is a common treatment for the condition, but it is expensive, making it less common in developed countries.

It is also a lot more common in poorer countries and it has a higher risk of side effects, including heart attacks and strokes.

The vaccines are a combination of a common cold vaccine and a beta-blocker that block the production of certain hormones, such as cortisol, which can lead to heart problems.

It can be prescribed by doctors to treat people who have mild or moderate symptoms of the condition.

This article is part of our new special series on health topics.