Heart and circulatory system

Intuniv (guanfacine): Common and Serious Side Effects

A brief overview of precautions and side effects for Intuniv (guanfacine).

• Intuniv
• ADHD

Can saline irrigation help nasal allergies?

In a recent survey, almost 90% of family physicians recommended nasal saline irrigation for sinus and nasal symptoms.

Keratoconus

Scleral contact lenses may be an alternative to surgery for many patients with keratoconus.

Lying hamstring curl with weight machine

The lying hamstring curl with weight machine exercise targets the back of the thigh. See how it's done.

Retina

This animation shows the process in which light is transformed by the retina as electrical impulses that travel to the brain through the optic nerve.

• Vision