varithena - Medication Listings

VARITHENA injectable foam contains the sclerosant, polidocanol. It is intended for intravenous use only. Chemically, polidocanol is polyoxyl lauryl ether. The structural formula is represented below: Polidocanol has the molecular formula CH 3 (CH 2 ) 11 (OCH 2 CH 2 ) n OH and a molecular weight of 582.9 when the average ethylene glycol moieties is nine (n=9). Polidocanol is a white to almost white, waxy, hygroscopic solid that is soluble in water and alcohol and melts at temperatures above 20°C. VARITHENA is a sterile, injectable foam of an aqueous polidocanol solution (1%) containing the following inactive ingredients: alcohol (4.2% w/w, purity 96% v/v) disodium hydrogen phosphate dihydrate (0.24% w/w), and potassium dihydrogen phosphate (0.085% w/w) with a pH of 6.0-7.5. The injectable foam is generated after activation of the polidocanol canister with oxygen from a second aluminum canister, resulting in a final gas mixture of oxygen:carbon dioxide in a ratio of 65:35 with low (<0.8%) nitrogen content. At the time of use, VARITHENA is generated as an injectable foam of controlled density and bubble size. The foam is then transferred to a syringe through the VARITHENA transfer unit. The injectable foam has a liquid to gas ratio of approximately 1:7 by volume. The median bubble diameter is less than 100 µm and no bubbles are greater than 500 µm. polidocanol Structural Formula