It should start to work in minutes so long as you are sexually stimulated. Very common vardenafil side-effects these affect more than 1 in 10 men What can I do if I experience this? Common ones include: Flushing of the skin. How to take Levitra Take one tablet whole with a glass of water. Remember to only take Levitra or Vardenafil as your clinician advises.How long does Levitra last? The Levitra half-life when taking a standard 10mg dose is four to five hours. This means that the effects of Levitra will last for up to . Erection lasting for more than 4 hours Headache (up to 15%) Flushing (up to 11%) Stuffy nose (up to 9%) Indigestion (up to 4%) —skin rash,, swelling of the face, . In combination with sexual stimulation, vardenafil works by increasing blood flow to the penis to help a man get and keep an test1.ru drug does not protect against .