Figure 2 summarizes the 24-hourpharmacokinetic profile of DHT for patients maintained on testosterone gel 50mg or testosterone gel 100 mg for 30 days. Figure 1 summarizes the 24-hourpharmacokinetic profile of testosterone for patients maintained on testosteronegel 50 mg or testosterone gel 100 mg for 30 days. Testosterone gel delivers physiologic amounts oftestosterone, producing circulating testosterone concentrations thatapproximate normal levels (e.g., 300 – 1000 ng/dL) seen in healthy men. There were no reports of overdose in the testosterone gelclinical trials. There is insufficient long-term safety data in geriatricpatients to assess the potentially increased risks of cardiovascular diseaseand prostate cancer see WARNINGS AND PRECAUTIONS. Although it is not known how much testosterone transfersinto human milk, Vogelxo is contraindicated in nursing women because of thepotential for serious adverse reactions in nursing infants. Secondary exposure to testosterone in children and womencan occur with the use of testosterone gel products in men. Patients should be instructed to prime the pump beforeusing it for the first time by fully depressing the pump mechanism (actuation)3 times and discard this portion of the product to assure precise dosedelivery. Morning, predose serum testosteroneconcentrations should be measured approximately 14 days after initiation oftherapy to ensure proper serum testosterone concentrations are achieved. One pump actuation dispenses 1.25 g of gel, which contains 12.5 mg of testosterone. Vogelxo is available in unit-dose tubes, unit-dose packets, and a metered-dose pump. Vogelxo (testosterone) gel, for topical use is a clear to translucent hydroalcoholic topical gel containing testosterone, an androgen. Used Vogelxo tubes, packets or pumps should be discardedin household trash in a manner that prevents accidental exposure of women,children, or pets see BOXED WARNING and WARNINGS AND PRECAUTIONS.Contents are flammable see WARNINGS AND PRECAUTIONS. Each 88 gmetered-dose pump is capable of dispensing 75 g of gel or 60-metered pumpactuations. After the priming procedure, patients should completely depress thepump one time (actuation) for every 12.5 mg of testosterone required to achievethe daily prescribed dosage. As of November 2016update, testosterone is available in Canada in the form of topical gels (AndroGel, Testim), topical solutions (Axiron), transdermal patches (Androderm), and intranasal gels (Natesto). The pharmacokinetics of testosterone, including its bioavailability, circulating testosterone levels, metabolism, biological half-life, and other parameters, differ by route of administration. These metabolites, along with estradiol, may be involved in a number of the effects of testosterone in the brain, including its antidepressant, anxiolytic, stress-relieving, rewarding, and pro-sexual effects. Estrogens can reduce the effects of testosterone by increasing the hepatic production and in turn circulating levels of sex hormone-binding globulin (SHBG), a carrier protein that binds to and occupies androgens like testosterone and DHT, and thereby reducing free concentrations of these androgens. As only a very small fraction of testosterone is converted into estradiol, this does not affect testosterone levels, but it can prevent estrogenic side effects like gynecomastia that can occur when testosterone is administered at relatively high dosages. In addition, local levels of DHT in so-called androgenic (5α-reductase-expressing) tissues are also markedly reduced, and this can have a strong impact on certain effects of testosterone. However, these drugs do this via prevention of the conversion of testosterone into its more potent metabolite dihydrotestosterone (DHT), and this results in dramatically reduced circulating levels of DHT (which circulates at much lower relative concentrations). It is recommended that physicians screen for prostate cancer with a digital rectal exam and prostate-specific antigen (PSA) level before starting therapy, and monitor PSA and hematocrit levels closely during therapy. Results from the TRAVERSE trial were submitted in 2023, concluding that there was no increase in the risk of adverse cardiovascular outcomes in men using testosterone for hypogonadism. Other side effects include increased hematocrit, which can require venipuncture in order to treat, and exacerbation of sleep apnea. Adverse effects may also include minor side effects such as oily skin, acne, and seborrhea, as well as loss of scalp hair, which may be prevented or reduced with 5α-reductase inhibitors. Breast cancer is said by some sources to be an absolute contraindication of testosterone therapy, but androgens including testosterone have also actually been used to treat breast cancer. In some of the cases, direct contact with the sites ofapplication on the skin of men using testosterone gel was reported. No testosterone gelpatients discontinued due to skin reaction. In this clinical trial oftestosterone gel, six patients had adverse events that led to theirdiscontinuation. Vogelxo is also supplied in a metered-dose pump thatdelivers 12.5 mg of testosterone per complete pump actuation. Vogelxo (testosterone) gel is a clear to translucenthydroalcoholic topical gel for topical use available in unit-dose tubes,unit-dose packets, and multiple-dose metered pumps. No studies were conducted in patients with hepaticimpairment. If this drug is used during pregnancy or if thepatient becomes pregnant while taking this drug, the patient should be madeaware of the potential hazard to the fetus. Testosterone is teratogenic and may cause fetal harm.Exposure of a fetus to androgens, such as testosterone, may result in varyingdegrees of virilization. Testosterone is also known toincrease the number of tumors and decrease the degree of differentiation ofchemically induced carcinomas of the liver in rats. It is unclear if the use of testosterone for low levels due to aging is beneficial or harmful. By staying informed and proactive, American men can navigate the complexities of testosterone therapy with confidence and care. American men using Androgel must be proactive in managing their health, particularly in relation to liver function. If liver function tests indicate issues, adjustments to the treatment plan, such as dosage changes or alternative therapies, may be necessary. They should educate patients about the potential risks and the importance of regular monitoring.