There is no safe dose during pregnancy. Common malformations include craniofacial, cardiovascular, thymic, and central nervous system (CNS) abnormalities. Although there appears to be minimal, if any, risk of retinoid embryopathy in fetuses conceived by males taking systemic retinoids, it is commonly recommended that men avoid retinoid therapy when actively trying to father children. Prescribing of isotretinoin in the U.S. is restricted via the risk-mitigation iPLEDGE system (Goldsmith et al., 2004). Serum lipid elevation is the most common laboratory abnormality. This may be due to increased expression of apolipoprotein C-III by systemic retinoids, which prevents the uptake of lipids from very-low-density lipoproteins into cells (Vahlquist et al., 2008). Other, less common, laboratory abnormalities include elevated transaminases, decreased thyroid hormone, and leukopenia. A baseline evaluation of serum lipids, serum transaminases, and complete blood count (CBC) and a pregnancy test should be obtained prior to starting any systemic retinoids. Laboratory values should be checked monthly for the first 3-6 months and once every 3 months thereafter