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Agree monitoring and costs before you decide.
| Harrington Clinic | What to check elsewhere | |
|---|---|---|
| Transfer consultation | Free, with a GMC doctor | Fees vary |
| Existing blood results | Used where clinically valid | May require retesting |
| Monitoring schedule | Planned ahead; labs included on Concierge | Often extra |
| Clinician access | Named clinician and patient portal | Varies |
| Medication changes | No double-billing on switches | Check costs |
| Regulation | CQC clinic, GPhC partner pharmacy | Check registration |
Other providers vary. Check your current service and the inclusion details of your chosen Harrington membership.



TRT is an effective treatment, but it is a medicine with real trade-offs. Here is what you should weigh up before starting.
Acne, oily skin, mood changes, mild fluid retention and a raised red blood cell count (haematocrit) are the most commonly reported effects. These are monitored through regular blood tests and managed by adjusting your dose.
Testosterone replacement therapy (TRT) suppresses your body's own testosterone production and can reduce sperm count while you are on treatment. If you are planning a family, tell your clinician — fertility-preserving alternatives such as clomiphene or hCG may be more appropriate.
For most men TRT is ongoing. Stopping abruptly can cause levels to fall quickly and symptoms to return, so any change should be planned with your clinician.
TRT is only prescribed where low testosterone is clinically confirmed. It is not prescribed for muscle building or athletic performance, and some medical histories make it unsuitable.
Ongoing blood tests and reviews are part of safe treatment. If you are unable to commit to monitoring, TRT is not appropriate for you.
More detail is set out in our frequently asked questions. Your clinician will go through all of this with you before prescribing.