비아그라에 대한 2분 법칙
Shake the bottle very well for a minimum of 10 seconds ahead of each use. Clear away the cap by pushing it down and twisting it counter-clockwise. Push the plunger of your syringe, then insert the idea in to the bottle whilst Keeping the bottle upright on the flat surface. Bit by bit pull back the plunger till the expected dose. If the thing is air