Will not just take Sildenafil (sildenafil citrate), Tadalafil or Vardenafil if you take medication made up of nitrates or guanylate cyclase stimulators for pulmonary hypertension as This might induce an unsafe fall in blood pressure or If you're allergic to sildenafil, tadalafil or any substances in either“This was my 1st time making use of telem