The vertebral column is a collection of individual bones  called vertebrae that encase and protect thâ¦e spinal cord. The  vertebral column is divided into three parts: seven cervical (neck)  vertebrae at the top, twelve thoracic vertebrae in the midback, and  five lumbar vertebrae in the lower back.
Clopidogrel is used to prevent heart attacks and strokes in persons with heart disease (recent heart attack), recent stroke, or blood circulation disease (peripheral vascular disease).
Sildenafil relaxes muscles found in the walls of blood vessels and increases blood flow to particular areas of the body. Sildenafil under the name Viagra is used to treat erectile dysfunction (impotence) in men. Another brand of sildenafil is Revatio, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women. Do not take Viagra while also taking Revatio, unless your doctor tells you to.