It can stay effective in your system for up to 36 hours. What is Cialis and how does it work? If you participate in sexual activity more than twice each week, Cialis Daily 5mg can be used every day instead. Which is better – Viagra or Cialis? Pharmica is a UK registered online pharmacy, specialising in prescription medications.Published 14 March Cialis Together (containing 10mg tadalafil citrate) will be available to purchase from pharmacies, if marketed. This means that in the future, it could be . 8, people reviewed this product. Cialis is a modern medication for erectile dysfunction that acts fast and lasts longer. Price Checker. Branded / Generic. Strength. Quantity. £ . You will be unsuitable for Cialis if you are taking alpha-blockers (such as doxazosin or tamsulosin), nicorandil or nitrates, such as GTN spray or isosorbide mononitrate tablets .