If you take tadalafil for pulmonary arterial hypertension, don't take Cialis® or other PDE5 inhibitors, such as sildenafil (Revatio® or Viagra®) or vardenafil (Levitra®). Cialis® also contains tadalafil. If you are taking too much tadalafil or consider it along with these medicines, the chance for Negative effects will probably be bi… Read More