cernos gel is a medicine used in the treatment of male hypogonadism caused due to low testosterone levels. it is only prescribed to men with known medical conditions. it helps in restoring the level of testosterone in the male body.cernos gel is for external use only. it should be applied on arms and shoulder once a day, preferably at the same time every day. it should be used as your doctor's advice. you should use this medicine for as long as it is prescribed for you. do not use the gel too often and avoid applying it over genital's area. you must wear clothes, once application area get dried completely.