Kelvin Koehn
SubscribersAbout
Interestingly, previous data that used imaging (computed tomography or ultrasound) to estimate SC fat thickness and compared it with the length of the needle (or placement of the injectate) estimated that 12% to 85% of IM injections administered to men were actually SC (31-33). The viability of using SC route for sex steroid administration was also shown in an elegant pharmacokinetic study in which nandrolone decanoate was administered to healthy male volunteers (30). Owing to the convenience of self-administration of testosterone esters, the SC route has recently gained popularity. However, this device is expensive compared to administration of ester with conventional syringe and needles. Recently, after assessing its safety and efficacy, the Food and Drug Administration approved an autoinjector device for weekly SC self-administration of testosterone enanthate (27, 29). Topical gels require daily application, can be messy, and carry the risk of exposure to those who come in contact with the patient’s application site (14).
Increases in testosterone for patients who lose weight might be cumulative over time. One RCT by Maggi et al. followed 715 testosterone deficient men for 12 weeks to evaluate the effects of a 2% transdermal testosterone agent on sex drive and energy. Six patients experienced biochemical recurrence, all of whom had intermediate- or high-risk prostate cancer.
Given these inconsistences, prevalence of low testosterone has varied dramatically among studies, with statistics reporting %.5-8 A summary of findings from four large-scale contemporary prevalence studies can be found in Table 3 (See button below). Across the prevalence literature, the cut-off values used to define low testosterone vary widely, heterogeneity exists in the populations studied, the forms of testosterone used to measure testosterone (total and/or free) are not consistent, and the assays utilized to measure testosterone differ. The prevalence of testosterone deficiency in the American male population is difficult to quantify. 750mg injection at weeks 0, 4, and every 10 weeks thereafter To merely refer to injectable or gel testosterone formulations without differentiation does not impart complete and accurate information to the reader. Within this modality family alone, there are three different application sites, including upper body, thigh, and axilla, with four different dosing ranges for each gel. For example, there are several testosterone gels available in 1%, 1.62%, and 2% formulations, each marketed under a different brand or generic name.
Absorption occurs through uniform erosion of the pellet’s surface in correspondence to the solubility of testosterone in extracellular fluid. Testosterone pellets consist of crystalline testosterone and are created through high-temperature molding and designed for consistent and prolonged release (21). In an open-label phase III trial assessing nasal testosterone usage in 306 hypogonadal men (testosterone avg of 421 ng/dL, while 10% remained subtherapeutic (18).
Men who were taking medication known to affect androgen production and/or testosterone were likewise excluded. Increasing patient age and increasing duration of prior exogenous testosterone use both significantly reduced the likelihood of reaching the 5 million TMSC benchmark. Older meta-analyses from 2007 and 2005 similarly demonstrated no impact of testosterone on lipid profiles.312, 327
A PK study evaluated serum levels of testosterone periodically for 14 days after administration of TC 200 mg IM in 11 hypogonadal men (42). Dose adjustments should be made based on serum testosterone levels measured 14 days after initiation, and drawn two to eight hours after dose application. The study concluded that Vogelxo® gel is better tolerated than transdermal testosterone patches, and can better normalize serum testosterone levels with titration (36). In a randomized, parallel treatment group study of 406 subjects with low serum testosterone, two doses of Vogelxo® were compared to a testosterone patch and placebo gel (36). Dose adjustments are based on serum testosterone levels measured 14 days after starting therapy.
Yes, physical activity can increase testosterone levels in women, although typically to a lesser extent than in men. While testosterone levels naturally decline with age, regular physical activity can help mitigate this decline and maintain healthy hormone levels throughout life. Chronic stress can significantly lower testosterone levels by elevating cortisol, which interferes with testosterone production. Healthy testosterone levels are crucial for overall well-being. Yes, physical activity, particularly resistance training and high-intensity interval training (HIIT), can indeed increase testosterone levels. The PK profile of TU does not demonstrate supratherapeutic peaks, and trough levels are seen later after each injection when compared to TE and TC (47). Overall, levels were similar after the third and fourth injections, with a mean Cmax of 813 ng/dL reached by day seven and a mean Cmin between 323 to 339 ng/dL by week 10 after each injection.
ARatio of AUC0-168h of DHT and estradiol to AUC0-168h of serum total T at week 6 of treatment. Additionally, serum DHT and estradiol concentrations remain stable with few fluctuations after SC injections of testosterone enanthate (Fig. 7) (27). Serum total A, testosterone; B, 5-dihydrotestosterone; and C, estradiol concentrations after subcutaneous (SC) or intramuscular (IM) administration of 1000 mg of testosterone undecanoate. Therefore, the Food and Drug Administration has recommended that IM administration of testosterone undecanoate be performed slowly by trained personnel in the clinic, and the patient should be observed for at least 30 minutes after injections. A, Serum total testosterone concentrations in 63 transgender men on weekly subcutaneous testosterone enanthate or cypionate. Mean serum testosterone concentrations did not change significantly after switching administration routes (Fig. 4B) (24), confirming similar bioavailability after SC administration.
This variation was tested in a sub-study of The Testosterone Trials, where hypogonadal older men administered 1 % AndroGel daily for 12 months. The gel was applied over a large area of skin over the shoulders and upper arms and over the abdomen. 35-37 The application to the skin has to be rotated and application to the same area should be avoided for at least 7 days. The only available testosterone patch is Androderm®; which can be applied to the body and is available as a 2 or 4 mg testosterone patch.
Increases in testosterone for patients who lose weight might be cumulative over time. One RCT by Maggi et al. followed 715 testosterone deficient men for 12 weeks to evaluate the effects of a 2% transdermal testosterone agent on sex drive and energy. Six patients experienced biochemical recurrence, all of whom had intermediate- or high-risk prostate cancer.
Given these inconsistences, prevalence of low testosterone has varied dramatically among studies, with statistics reporting %.5-8 A summary of findings from four large-scale contemporary prevalence studies can be found in Table 3 (See button below). Across the prevalence literature, the cut-off values used to define low testosterone vary widely, heterogeneity exists in the populations studied, the forms of testosterone used to measure testosterone (total and/or free) are not consistent, and the assays utilized to measure testosterone differ. The prevalence of testosterone deficiency in the American male population is difficult to quantify. 750mg injection at weeks 0, 4, and every 10 weeks thereafter To merely refer to injectable or gel testosterone formulations without differentiation does not impart complete and accurate information to the reader. Within this modality family alone, there are three different application sites, including upper body, thigh, and axilla, with four different dosing ranges for each gel. For example, there are several testosterone gels available in 1%, 1.62%, and 2% formulations, each marketed under a different brand or generic name.
Absorption occurs through uniform erosion of the pellet’s surface in correspondence to the solubility of testosterone in extracellular fluid. Testosterone pellets consist of crystalline testosterone and are created through high-temperature molding and designed for consistent and prolonged release (21). In an open-label phase III trial assessing nasal testosterone usage in 306 hypogonadal men (testosterone avg of 421 ng/dL, while 10% remained subtherapeutic (18).
Men who were taking medication known to affect androgen production and/or testosterone were likewise excluded. Increasing patient age and increasing duration of prior exogenous testosterone use both significantly reduced the likelihood of reaching the 5 million TMSC benchmark. Older meta-analyses from 2007 and 2005 similarly demonstrated no impact of testosterone on lipid profiles.312, 327
A PK study evaluated serum levels of testosterone periodically for 14 days after administration of TC 200 mg IM in 11 hypogonadal men (42). Dose adjustments should be made based on serum testosterone levels measured 14 days after initiation, and drawn two to eight hours after dose application. The study concluded that Vogelxo® gel is better tolerated than transdermal testosterone patches, and can better normalize serum testosterone levels with titration (36). In a randomized, parallel treatment group study of 406 subjects with low serum testosterone, two doses of Vogelxo® were compared to a testosterone patch and placebo gel (36). Dose adjustments are based on serum testosterone levels measured 14 days after starting therapy.
Yes, physical activity can increase testosterone levels in women, although typically to a lesser extent than in men. While testosterone levels naturally decline with age, regular physical activity can help mitigate this decline and maintain healthy hormone levels throughout life. Chronic stress can significantly lower testosterone levels by elevating cortisol, which interferes with testosterone production. Healthy testosterone levels are crucial for overall well-being. Yes, physical activity, particularly resistance training and high-intensity interval training (HIIT), can indeed increase testosterone levels. The PK profile of TU does not demonstrate supratherapeutic peaks, and trough levels are seen later after each injection when compared to TE and TC (47). Overall, levels were similar after the third and fourth injections, with a mean Cmax of 813 ng/dL reached by day seven and a mean Cmin between 323 to 339 ng/dL by week 10 after each injection.
ARatio of AUC0-168h of DHT and estradiol to AUC0-168h of serum total T at week 6 of treatment. Additionally, serum DHT and estradiol concentrations remain stable with few fluctuations after SC injections of testosterone enanthate (Fig. 7) (27). Serum total A, testosterone; B, 5-dihydrotestosterone; and C, estradiol concentrations after subcutaneous (SC) or intramuscular (IM) administration of 1000 mg of testosterone undecanoate. Therefore, the Food and Drug Administration has recommended that IM administration of testosterone undecanoate be performed slowly by trained personnel in the clinic, and the patient should be observed for at least 30 minutes after injections. A, Serum total testosterone concentrations in 63 transgender men on weekly subcutaneous testosterone enanthate or cypionate. Mean serum testosterone concentrations did not change significantly after switching administration routes (Fig. 4B) (24), confirming similar bioavailability after SC administration.
This variation was tested in a sub-study of The Testosterone Trials, where hypogonadal older men administered 1 % AndroGel daily for 12 months. The gel was applied over a large area of skin over the shoulders and upper arms and over the abdomen. 35-37 The application to the skin has to be rotated and application to the same area should be avoided for at least 7 days. The only available testosterone patch is Androderm®; which can be applied to the body and is available as a 2 or 4 mg testosterone patch.
