A week-old newborn male presents to clinic for a routine checkup. His birth history and delivery were uncomplicated. He is being breastfed and has had no difficulty feeding. The parents are concerned because he does not seem to have male genital characteristics. Physical examination reveals female external genitalia seen without a scrotum or descended testicles. What androgen is the patient lacking that is the cause of his condition?

A week-old newborn male presents to clinic for a routine checkup. His birth history and delivery were uncomplicated. He is being breastfed and has had no difficulty feeding. The parents are concerned because he does not seem to have male genital characteristics. Physical examination reveals female external genitalia seen without a scrotum or descended testicles. What androgen is the patient lacking that is the cause of his condition?

A 37-year-old man is found to have hypercholesterolemia during a routine checkup. The physician prescribes lovastatin and counsels the patient to make healthy dietary and lifestyle changes to keep his cholesterol under control. Two months later, he returns for a follow-up visit, and the physician discovers his LDL level remains virtually unchanged. He insists that he is taking the medication exactly as prescribed. The physician knows lovastatin is metabolized by the cytochrome P450 3A4. What else may he be using that would explain his condition?

A 27-year-old woman presents to clinic with infertility over the past 2 years. Her husband had a normal sperm analysis. She has also had weight gain and increased facial hair. Her labs show an increase in both her LH and FSH, with a ratio of LH:FSH of 2:1. What is the most appropriate medication to help her with her infertility?

A 76-year-old man presents to the clinic for follow-up of his benign prostatic hyperplasia. He has been doing well with his symptoms since starting finasteride. He no longer has as much difficulty starting his stream and feels that he empties his bladder completely. What is the mechanism of action of finasteride?

A 23-year-old woman presents to her primary care physician with an enlarging neck mass and weight loss. The large mass is seen in the midline of the neck. She has lost 15lb over the past month, feels like her heart is racing, and is always hot. The patient is diagnosed with Graves' disease and started on propylthiouracil. Which of the following is a side effect of propylthiouracil?