Transdermal patches (adhesive patches placed on the skin) may also be used to deliver a steady dose through the skin and into the bloodstream. Testosterone-containing creams and gels that are applied daily to the skin are also available, but absorption is inefficient (roughly 10%, varying between individuals) and these treatments tend to be more expensive. Individuals who are especially physically active and/or bathe often may not be good candidates, since the medication can be washed off and may take up to six hours to be fully absorbed. There is also the risk that an intimate partner or child may come in contact with the application site and inadvertently dose himself or herself; children and women are highly sensitive to testosterone and can suffer unintended masculinization and health effects, even from small doses. Injection is the most common method used by individuals administering AAS for non-medical purposes. 
Pregnancy & Nursing while on
Lithium [posted 10/2/98]
Question: I have bipolar disorder that responds very well to Lithium, 1200mg/day. I recently gave birth to my third child (on 6/21/98). I do not take Lithium during my pregnancy and I feel wonderful (very euthymic) pregnancy seems to be "protective" for me. However, I always have problems in the postpartum period. I want to breastffeed so I do not resume Lithium after delivery.. Now I am 8 weeks postpartum and having hypomanic symptoms (pressured speech, flight of ideas, extreme irritability and emotional lability, difficulty falling asleep) and I know it is time to start lithium. My question: what percent of the plasma concentration of lithium is secreted in breast milk? The PDR says only that lithium is secreted and discourages nursing an infant while on it, but does not elaborate. I would very much like to continue nursing, if only twice a day. Is there any new information on the risks of lithium to the nursing infant?