Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
ERLEADA vs ANDRODERM
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
Erleada (apalutamide) is an androgen receptor (AR) inhibitor that binds directly to the ligand-binding domain of the AR, preventing AR nuclear translocation, DNA binding, and transcription of AR target genes. It also inhibits AR-mediated tumor growth and reduces prostate-specific antigen (PSA) levels.
Testosterone is an androgen receptor agonist; it binds to androgen receptors, leading to changes in gene expression that promote male secondary sexual characteristics and maintain libido, muscle mass, and bone density.
Treatment of non-metastatic castration-resistant prostate cancer (nm CRPC),Treatment of metastatic castration-sensitive prostate cancer (m CSPC)
FDA-approved: testosterone replacement therapy in males for conditions associated with a deficiency or absence of endogenous testosterone (hypogonadism). Off-label: delayed puberty in males, female-to-male transgender hormone therapy.
240 mg orally once daily on an empty stomach, taken at least 1 hour before or 2 hours after a meal. Swallow tablets whole.
Apply one 2.5 mg or 5 mg transdermal system to clean, dry, intact skin on the abdomen, upper arms, or thighs once daily, preferably in the morning. Starting dose is 5 mg daily; adjust based on serum testosterone levels.
Terminal elimination half-life is approximately 20 hours (range 16-24 hours) at steady state, supporting once-daily dosing.
Terminal elimination half-life is approximately 10–100 minutes (rapid), but due to transdermal absorption, effective half-life is extended to about 8–10 hours after patch application.
Primarily metabolized by CYP2C8 and CYP3A4 to form active metabolites (N-desmethyl apalutamide). It is also a strong inducer of CYP3A4 and CYP2C9, and has moderate effects on CYP2C19 and UGTs.
Testosterone is metabolized primarily in the liver via CYP3A4 and CYP2C9 isoenzymes, as well as by 5α-reductase to dihydrotestosterone (DHT) and by aromatase to estradiol.
Fecal (87.4%) as unchanged drug and metabolites; renal (2.4%) as unchanged drug.
Approximately 90% of testosterone metabolites are excreted in urine as glucuronide and sulfate conjugates; 6% are excreted in feces via bile.
Highly protein bound (97%) primarily to albumin and α1-acid glycoprotein (AAG).
Approximately 98–99% bound: primarily to sex hormone-binding globulin (SHBG, ~40%) and albumin (~60%).
Apparent volume of distribution (Vd/F) is approximately 157 L (about 2.2 L/kg for a 70 kg adult), indicating extensive extravascular distribution.
Volume of distribution is approximately 0.2–0.8 L/kg, reflecting distribution into steroid-sensitive tissues and binding proteins.
Oral bioavailability is not determined due to lack of intravenous formulation; after oral administration, absorption is rapid with Tmax of 2 hours under fasting conditions; food increases Cmax by 2- to 4-fold and AUC by 2-fold.
Transdermal bioavailability is approximately 10–15% of the nominal dose (based on 24-hour application), with interindividual variability due to skin permeability.
No dose adjustment required for mild to moderate renal impairment (Cr Cl ≥30 m L/min). Not studied in severe renal impairment (Cr Cl <30 m L/min) or end-stage renal disease; use with caution.
No specific dose adjustment recommended for renal impairment. Use with caution in patients with severe renal impairment due to potential fluid retention.
Mild hepatic impairment (Child-Pugh A): no dose adjustment. Moderate (Child-Pugh B): reduce dose to 120 mg once daily. Severe (Child-Pugh C): not recommended.
Contraindicated in patients with severe hepatic impairment (Child-Pugh class C). In mild to moderate impairment (Child-Pugh A or B), use with caution and monitor liver function; no specific dose adjustment guidelines.
Safety and efficacy not established in pediatric patients; no specific pediatric dosing available.
Not indicated for use in pediatric patients. Safety and efficacy have not been established in children <18 years.
No specific dose adjustment required based on age alone; monitor for adverse effects (e.g., falls, hypertension) more frequently in elderly patients.
Initiate at 2.5 mg once daily in elderly patients due to increased risk of adverse effects, particularly prostatic hyperplasia and cardiovascular events. Monitor serum testosterone levels and adjust as needed.
No boxed warning.
WARNING: Cardiovascular risk - Increased risk of myocardial infarction, stroke, and cardiovascular death has been reported with testosterone replacement therapy. Only use in men with confirmed hypogonadism.
Seizure: Increased risk, especially in patients with predisposing factors; discontinue if seizure occurs.,Falls and fractures: Increased incidence in clinical trials; assess fall and fracture risk.,Cardiovascular effects: Hypertension, especially in patients with pre-existing cardiovascular disease.,Thyroid dysfunction: Monitor thyroid function tests periodically.,Hypercholesterolemia: Monitor lipid profile and manage accordingly.,Hypersensitivity reactions: Including angioedema; discontinue if severe.
Elderly patients and those with known cardiovascular risk factors should be monitored for cardiovascular events.,May exacerbate sleep apnea in predisposed individuals.,Can cause erythrocytosis; monitor hematocrit.,May accelerate growth of prostate cancer and benign prostatic hyperplasia; monitor prostate-specific antigen (PSA).,Monitor for signs of virilization in women if used off-label.,Possible hypercalcemia in immobilized patients.
Pregnancy: Apalutamide can cause fetal harm and is contraindicated in pregnant women.,Severe hypersensitivity to apalutamide or any component of the formulation.
Men with carcinoma of the breast or known or suspected carcinoma of the prostate.,Women who are pregnant or may become pregnant (risk of virilization of fetus).,Hypersensitivity to testosterone or any component of the product.,Severe renal or hepatic impairment (risk of fluid retention).
Grapefruit and grapefruit juice may increase apalutamide concentrations; avoid consumption. No other food interactions known.
No known food interactions. Take with or without food.
Risk Category X. ERLEADA (apalutamide) can cause fetal harm when administered to a pregnant woman. Nonclinical studies have demonstrated teratogenicity, including skeletal abnormalities and reduced fetal weight, at exposures below the recommended human dose. As male patients exposed to ERLEADA may father a child, a pregnancy test should be conducted for female partners of reproductive potential prior to initiating therapy. Advise male patients to use effective contraception during treatment and for 3 months after the last dose. If this drug is used during pregnancy, or if the patient becomes pregnant while taking this drug, apprise the patient of the potential hazard to the fetus.
Androderm (testosterone) is contraindicated in pregnancy due to virilization of female fetus. First trimester: high risk of pseudohermaphroditism in female fetuses (labial fusion, clitoromegaly) with androgen exposure during critical period of genital differentiation (weeks 8-12). Second and third trimesters: risk of clitoral enlargement, advanced bone age, and potential long-term behavioral effects. Male fetuses may experience premature sexual development. No adequate studies; USP pregnancy category X.
No data available on the presence of apalutamide in human milk, its effects on the breastfed infant, or its effects on milk production. Because of the potential for serious adverse reactions in breastfed infants from ERLEADA, advise women not to breastfeed during treatment and for at least 3 months after the last dose. The milk-to-plasma ratio is unknown.
Testosterone is excreted into human milk; M/P ratio not established. Potential for virilization of female infants and early puberty in male infants. Risk of suppression of maternal lactation (androgen-induced decrease in prolactin). Contraindicated during breastfeeding; alternative therapies recommended.
ERLEADA is contraindicated in pregnancy. No dose adjustment is recommended for non-pregnant patients; however, due to the risk of fetal harm, use is not recommended during pregnancy. Pharmacokinetic changes of apalutamide specifically during pregnancy have not been studied, and no dose adjustments are recommended as the drug is not used in pregnant women.
Androderm is contraindicated in pregnancy; no dose adjustments applicable. If therapy is necessary for maternal hypogonadism, discontinue immediately upon pregnancy recognition. Pharmacokinetic changes in pregnancy (increased clearance, volume of distribution) are irrelevant due to contraindication. Do not dose in pregnancy.
ERLEADA (apalutamide) requires concomitant use with a Gn RH analog or bilateral orchiectomy. Monitor for hypertension, hypothyroidism, and hypercholesterolemia. Falls and fractures are increased; assess fracture risk. Use with caution in patients at risk for seizures, as clinical seizures occurred in 0.2% of patients. Dose adjustment for CYP3A4 substrates with narrow therapeutic index.
Apply to clean, dry, intact skin on the abdomen, thighs, upper arms, or back. Rotate application sites to minimize skin reactions. Do not apply to genitals or scrotum. Avoid showering or swimming for at least 3-4 hours after application to ensure absorption. Monitor serum testosterone levels 14 days after starting therapy or dose adjustment, drawn in the morning before application. Use with caution in patients with known or suspected prostate cancer or breast cancer. Warn patients about the risk of transfer to women and children through skin contact; cover application site with clothing or wash skin before contact.
Take ERLEADA once daily at the same time each day, with or without food. Swallow tablets whole; do not crush or chew.,Use effective contraception during treatment and for 3 months after last dose. ERLEADA can cause fetal harm.,Report any signs of infection, falls, fractures, or seizures immediately. Risk of falls and fractures is increased.,Blood pressure, thyroid function, and cholesterol levels will be monitored regularly. Report symptoms of hypothyroidism like fatigue or cold intolerance.,Avoid grapefruit, grapefruit juice, or products containing grapefruit while on ERLEADA.
Apply the gel to clean, dry, intact skin once daily in the morning.,Rotate application sites to prevent skin irritation.,Avoid direct skin contact with women and children; wash hands thoroughly after application and cover the site with clothing.,Do not apply to the genitals or scrotum.,Do not shower or swim for at least 3-4 hours after application.,Monitor for signs of skin irritation, such as redness or itching.,Report any swelling of the ankles, difficulty breathing, or changes in mood or sleep.,Keep the medication away from children and pets.
No interactions on record
No interactions on record
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about ERLEADA vs ANDRODERM, answered by our medical review team.
ERLEADA is a Androgen Receptor Inhibitor Antineoplastic that works by Erleada (apalutamide) is an androgen receptor (AR) inhibitor that binds directly to the ligand-binding domain of the AR, preventing AR nuclear translocation, DNA binding, and transcription of AR target genes. It also inhibits AR-mediated tumor growth and reduces prostate-specific antigen (PSA) levels.. ANDRODERM is a Androgen that works by Testosterone is an androgen receptor agonist; it binds to androgen receptors, leading to changes in gene expression that promote male secondary sexual characteristics and maintain libido, muscle mass, and bone density.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between ERLEADA and ANDRODERM depend on the specific clinical indication. These are agents from distinct pharmacological classes and are not directly interchangeable by dose. A physician or clinical pharmacist should guide any therapeutic switching decisions.
The standard adult dose of ERLEADA is: 240 mg orally once daily on an empty stomach, taken at least 1 hour before or 2 hours after a meal. Swallow tablets whole.. The standard adult dose of ANDRODERM is: Apply one 2.5 mg or 5 mg transdermal system to clean, dry, intact skin on the abdomen, upper arms, or thighs once daily, preferably in the morning. Starting dose is 5 mg daily; adjust based on serum testosterone levels.. Dosing should always be individualized based on indication, renal and hepatic function, age, and other patient factors.
No direct drug-drug interaction has been formally documented between ERLEADA and ANDRODERM in current clinical databases. However, individual patient risk factors including other medications, organ function, and comorbidities should always be evaluated by a qualified healthcare provider.
The maternal-fetal safety profiles differ. ERLEADA is classified as Category C. Risk Category X. ERLEADA (apalutamide) can cause fetal harm when administered to a pregnant woman. Nonclinical studies have demonstrated teratogenicity, including skeletal abnormal. ANDRODERM is classified as Category C. Androderm (testosterone) is contraindicated in pregnancy due to virilization of female fetus. First trimester: high risk of pseudohermaphroditism in female fetuses (labial fusion, . Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.