Both are rapidly broken down after contact with the vein wall and so does not circulate through the body as an active solution. The solution irritates the lining of the vessel causing it to swell and stick together. Over a period of weeks the vessel fades from view, eventually becoming barely or not at all visible. Depending on its size, a single blood vessel may have to be injected more than once. In each treatment session many vessels are injected but involves minimal discomfort because of the tiny diameter of the needles.
Some injections give a feeling like a bull ant bite.
Generally, it is ideal to have about 4 weeks between treatment sessions for the same leg but the alternate leg can be treated in the meantime. Following treatment sessions you will be required to wear a special venous compression stocking to assist in sealing off the abnormal veins. The length of time that the stocking will be required to be worn continuously varies from 3 days to 1 week but will usually be for 3 days after your first treatment and 0 - 3 days after your second treatment. This time will be determined by the size of the veins injected. It is very important to adhere strictly to the duration of compression in order to obtain the best result.