Viagra was the drug that changed the world in 1998 and revolutionised treatment for men with erectile dysfunction (ED). Cialis was the second ED drug brought to market and earned the nickname The Weekend Pill as it’s duration of action is 36 hours (Viagra lasts for 4 hours). Other tablets to treat ED are Levitra and Spedra.
Viagra has been ‘off patent’ since 2013 which means legal copies of the drug can now be sold in the UK as generics called sildenafil, and there are now many brands of sildenafil available. The patent for Cialis expired November 2017 and lower cost generic Tadalafil is also now available. Read in full