Dear Mick
Welcome to the site.
My OH was diagnosed in November 2011 with PSA 3.6 Gleason 3+4 T3b N1 M0.
He took part in the Stampede trial, which at that point was Arm G offering the standard treatment plus Abiraterone.
The standard treatment was Prostap and Radiotherapy.
Apart from taking a lot of pills every day, and the usual side effects of fatigue, weight gain, etc the trial was manageable.
It meant a lot of additional appointments which meant that a good relationship was built up between ourselves and the nurses/ oncologist. It also meant that any other 'niggles' we're sorted promptly at these appointments rather than having to go back to the GP. We found it most helpful to get advice straight from the specialist. Examples include regular bone scans ( to monitor any weakening from the hormone treatment ) and regular heart ECG tests etc plus some hearing tests when my OH had problems in that area.
Of course, I do not know if all hospitals are as thorough, but everyone that I have spoken to regarding the trial has stated that the levels of care have been high.
In terms of the Abiraterone, which was taken with a steroid, this caused my OH blood pressure to increase which he was given tablets for. His Potassium also started to get low so supplements of this were given. These issues were monitored carefully at appointments.
He took the Abiraterone for 2 years and continued on HT for 3.5 years.
If you have the time for the additional appointments, fortnightly then monthly then 6 weekly etc over a period of 2 years I would advise that you go for it! But of course everyone's circumstances are different and it is entirely up to you.
Remember that if you are not happy you can stop the trial at any time.
Best wishes with your decision
Alison