Starting Dose of Jatenzo for Hypogonadism
Start Jatenzo at 237 mg orally twice daily (once in the morning and once in the evening), taken with food. 1
Dosing Algorithm
Initial Dosing
- Starting dose: 237 mg twice daily (morning and evening with food) 1
- This is the FDA-approved starting dose for all patients with confirmed hypogonadism
Dose Titration Protocol
After starting treatment, follow this structured approach:
Timing of first assessment:
- Wait 7 days after starting before checking testosterone levels 1
- Draw blood 6 hours after the morning dose using plain tubes 1
Dose adjustment based on testosterone levels:
| Testosterone Level (6h post-dose) | Current Dose | New Dose |
|---|---|---|
| <425 ng/dL | 237 mg BID | 316 mg BID (two 158 mg capsules) |
| 425-970 ng/dL | Any dose | No change |
| >970 ng/dL | 237 mg BID | 198 mg BID |
Ongoing Monitoring
- Recheck testosterone levels 7 days after any dose adjustment 1
- Once stable, monitor periodically (6 hours post-morning dose) 1
- Always maintain the same dose for both morning and evening administration 1
Critical Prerequisites
Before initiating Jatenzo, you must:
- Confirm hypogonadism with morning testosterone levels measured on at least 2 separate days, both below normal range 1
- Check baseline hematocrit (must not be elevated) 1
- Ensure patient can take medication with food (required for absorption) 1
Important Clinical Considerations
Why this specific starting dose matters: The 237 mg twice daily starting dose was validated in phase 3 trials, where 87% of hypogonadal men achieved eugonadal testosterone levels with dose titration 2. Research demonstrates that single blood sample titration at 4-6 hours post-dose yields 93% efficacy, making this a practical and effective monitoring strategy 2.
Common pitfalls to avoid:
- Do not start at lower doses hoping to "ease into" therapy—237 mg BID is already optimized for initial restoration of testosterone levels
- Do not check testosterone levels before 7 days—insufficient time for steady-state
- Do not draw blood at random times—the 6-hour post-dose timing is critical for accurate dose adjustment 1
- Never skip the "with food" requirement—oral testosterone undecanoate requires food for proper absorption 1
Safety monitoring:
- Hematocrit every 3 months (stop if elevated) 1
- Blood pressure monitoring (oral TU associated with 3-5 mmHg systolic BP increase) 2
- PSA and digital rectal exam per standard guidelines 3
- Watch for venous thromboembolism symptoms 1
The FDA labeling provides clear, evidence-based guidance that this 237 mg twice-daily starting dose effectively restores testosterone to physiologic levels in the majority of hypogonadal men, with straightforward titration based on objective laboratory values 1, 2.