These medications work by relaxing the blood vessels in the penis, allowing increased blood flow to help you to get and maintain an erection when you are aroused. (You will need to have sexual stimulation to help with this medication).
They all belong to the same group of medications but have a different active ingredient. There is a slight variation on how each tablet works, and they each have individual time frames for the onset of action and duration of action.
You may need to vary the timing and the dose, or type of medication to get the best individual result.
Your medication may not work the first time you try it, and you may need to take it on 4 to 6 separate occasions to assess the full effect. If it has not helped after this, you can contact us for advice.