The drug may cause adrenal insufficiency so the level of the adrenocortical hormones should be monitored while taking it. Oral ketoconazole has various contraindications, such as concomitant use with certain other drugs due to known drug interactions. Common side effects when taken by mouth include nausea, headache, and liver problems. However, it’s advisable to perform a strand test first to ensure it doesn’t affect the color or texture of your hair. While generally safe for long-term use as directed, it’s recommended to consult with a dermatologist if you require prolonged use. This limited systemic absorption is why the effect on testosterone, if any, is generally considered milder with the shampoo. The shampoo, on the other hand, is designed for topical application on the scalp, resulting in far less absorption into the bloodstream. It’s crucial to distinguish between topical and systemic ketoconazole. In premenopausal women with polycystic ovary syndrome, ketoconazole has been found to significantly decrease levels of androstenedione and testosterone and significantly increase levels of 17α-hydroxyprogesterone and estradiol. Suppression of testosterone levels by ketoconazole is generally partial and has often been found to be transient. As an antifungal, ketoconazole is structurally similar to imidazole, and interferes with the fungal synthesis of ergosterol, a constituent of fungal cell membranes, as well as certain enzymes. Activated charcoal may be administered within the first hour following overdose of oral ketoconazole. It recommends oral tablets should not be a first-line treatment for any fungal infection. Other contraindications of oral ketoconazole include liver disease, adrenal insufficiency, and known hypersensitivity to oral ketoconazole. Ketoconazole has been used to prevent the testosterone flare at the initiation of GnRH agonist therapy in men with prostate cancer. Most clinicians aim for mid‑normal total testosterone (often ~400–700 ng/dL), individualized to symptom control and side effects. For oral TU, plan regular blood pressure monitoring. The 2023 TRAVERSE trial in high‑risk men found testosterone was non‑inferior to placebo for major cardiac events over follow‑up, though there were slightly higher rates of atrial fibrillation, pulmonary embolism, and acute kidney injury. If you’re trying to conceive, avoid standard testosterone, it suppresses sperm production. Ketoconazole also selectively displaced steroids from serum-binding globulins. The blockade appeared related to the serum ketoconazole concentration. Oligospermia and azospermia after prolonged therapy were noted. Bound and free testosterone values were equally diminished. In some men, the serum testosterone concentrations were always subnormal. Higher therapeutic doses (ie, 800 to 1,200 mg/day), even once daily, caused more prolonged blockade. This action disrupts the integrity of the fungal cell, ultimately leading to its demise. Ketoconazole shampoo is a widely used antifungal medication primarily prescribed for treating scalp conditions like seborrheic dermatitis (dandruff) and tinea versicolor. First, and most notably, high oral doses of ketoconazole (e.g. 400 mg three times per day) block both testicular and adrenal androgen biosynthesis, leading to a reduction in circulating testosterone levels. Suppression of testicular testosterone synthesis and displacement of estrogens from sex hormone-binding globulin may decrease the androgen/estrogen ratio of the blood and contribute to the development of gynecomastia that has been reported in some ketoconazole-treated patients. The concentrations of ketoconazole that inhibited human chorionic gonadotropin stimulation of testicular androgen production and displaced sex steroids from sex hormone-binding globulin were in the range of blood levels found in patients on higher therapeutic dosage regimens. Numerous small studies have investigated the effects of oral ketoconazole on hormone levels in humans. The ratio of testosterone to estradiol is also decreased during oral ketoconazole therapy in men.
