Is it safe to take L-arginine and low dose daily Cialis (2.5 or 5mg) at the same time? How long do you recommend I taking L-arginine? Is the recommended dose of L-arginine 1000mg twice a day or is it 500mg twice a day?

With respect to the L-arginine, the recommended dosing has been 1000 mg twice per day, but this is not based on any type of well-controlled trial. There are no reports of taking Cialis with L-arginine causing low blood pressure, but this is a possible side effect.