비아그라에 대한 2분 법칙
Shake the bottle very well for a minimum of 10 seconds before each use. Take out the cap by pushing it down and twisting it counter-clockwise. Press the plunger from the syringe, then insert the idea in to the bottle though holding the bottle upright over a flat surface. Slowly but surely pull back the plunger until eventually the needed dose. If y