Query over 3 monthly dosage?

Usually different dosage level according to whether mthly, quarterly or half yearly. Thus:

Decapeptyl SR 3 mg is given as one injection every 28 days (4 weeks)

Decapeptyl SR 11.25 mg is given as one injection every 3 months (12 weeks)

Decapeptyl SR 22.5 mg is given as one injection every 6 months (24 weeks)

I suppose may be exceptions. 

Regards, Dave 

Excellent accurate figures...so if the nurse was right that's a .. . Up.I need to check with surgery and oncology I wonder  how much this has effected my psa values?Thanks 

Hi Big Col that is definitely not correct.  Do you have access to your NHS record?  If so, the dosage should be marked and if you only had a monthly last time, you should not wait for 3 months.  If you had the 3 monthly and then another 3 monthly a month after, I would talk to my oncologist.  

Thanks  David. I am about to ring the pharmacy and then the surgery