Med viscosity& needle gauge

[trucxrule]

Hello.

I have just begun injection therapy & was provided 27 G x 1/2 " needles from the compounding pharmacy. When I went in to refill I inquired about an alternate size & was told the 27 G was selected for use based on viscosity of the med I'm injecting ( Prost 20mcg) . I would still prefer a 30 or 31 G needle. Can anyone enlighten me on this matter?
Trucx~