Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry. Do not split, break, chew, or crush it. May increase risk of unwanted side effects eg, prolonged erection of the penis. It affects the way the medicine works. If you do not meet the NHS criteria for tadalafil, you may get a private prescription from a doctor. Click here for an email preview.Availability of a generic form. Cialis comes in a generic form called tadalafil. A generic drug is an exact copy of the active drug in a brand-name medication. If you have questions about Cialis, talk with your doctor. They can help advise you on whether Cialis could be a good treatment option for you. Here’s a list of questions you . Cialis doesn’t work right away. For the as-needed dose, plan to take Cialis at least 30 minutes before sexual activity, but bear in mind it may take as long as 2 hours to take effect. シアリスの成分「タダラフィル」の効果. 陰茎の海綿体には多くのPDE-5（5型ホスホジエステラーゼ）が存在していますが、通常時に勃起していないのはこのPDE-5の働きによるものです。. しかし、何らかの原因でPDE-5が増え過ぎると、勃起したいときにでき.