Sclerotherapy is most often used to treat varicose veins. Varicose veins are also known as chronic venous insufficiency. Varicose veins occur when the veins swell and bulge, usually in the legs. This is due to weak vein walls that, in turn, weaken the vein valves.

Generally, you need to wait about six weeks before undergoing another sclerotherapy session. Studies of sclerotherapy as a treatment for varicose and spider veins indicate that it has an overall success rate of about 60 to 80 percent in eliminating treated veins.

It varies from individual to individual but typically 2-4 treatments are required for the best results. In patients with a few veins, 1-2 sessions will suffice. More treatments are required where veins are more numerous and extensive.

Almost anyone with unwanted spider veins can be treated, except women who are pregnant or nursing. Other relative contraindications include those with skin infections, uncontrolled diabetes, fever, history of deep vein thrombosis, anticoagulant therapy those patients taking corticosteroids.

There is some mild pain which can easily be overcome with paracetamol or ibprofen. The injected site will appear bruised and swollen for a few days. Many practitioners advise the use of compression stockings or bandages after treatment in order to minimise bruising and maximise the benefit of treatment. The bruising usually disappears in 2-3 weeks. Most patients can resume their normal activities soon after treatment.