Hi Stuart,I had postap injection every 3 months till I started getting boils at the injection site(In my tummy).I had 3 lots of antibiotics before they put me on a different hormone injection that goes in my buttock.I think it's called Triptolerin.Iv had 3 ,So far seems to be ok.GP called it celulitas and was the first time she had seen it with Prostap.Hope this is helpful.Geoff