If this is your first treatment, your doctor may observe your response to a small dose prior to additional doses. This observation may take up to several hours depending upon the physician's discretion. Subsequent appointments should take less time. Most individuals have multiple spider veins or small varicose veins that need treatment, and only 10 to 20 injections can be done during each session, so the length of each session and the number of sessions is determined by the amount of work to be done. Sclerotherapy is a process, not a one-time treatment, so most patients require two or three sessions at weekly intervals.
Foam sclerotherapy is the latest development in the sclerotherapy field and is a more effective way to deliver the sclerosing agent directly to the problem vein. Foam sclerotherapy is a technique that involves injecting foamed sclerosant chemical within a blood vessel using a very small syringe. The “foam” works by forming a bond between the red blood cell and the foaming agent. This in turn creates a goo-like substance inside the vein which sticks to the wall of the vessel causing the vein to close. The procedure takes about 15 minutes, and typically the veins are eliminated in 3 to 4 weeks.