3 weeks or so. I actually talked with the syrg several weeks before my operation and he said test is fine to take. But I played it safe and got off several weeks before.
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Something like winny or var would jack up your blood pressure (as will most gear), and may cause bleeding complications during surgery... but gear + anaesthetic etc. won't kill you.
That said, talk to your doctor if really concerned, and don't shoot anything for a week or two pre-op.
I had the same problem getting ready to give my own for surgery. The third visit i said in not to polite a tone"Do you have a real BP Cuff for 19" arms???? End of BP problem these mofos should know this stuff