I am a 76 year old male who had a by-pass in 2012, has hypertension and heart disease?

I am a 76 year old male who had a by-pass in 2012, has hypertension and heart disease. My cardiologist has cleared me to have sex, but I am experiencing ED. I want to add L Arginine and Pycnogenol to my list of vitamins because I read that they may be helpful in combating ED. Is there a problem with also using Cialis or Viagra?

Age: 76
Male
Medications: Amlodipine 5mg, Losartan Potassium, 100mg, clopidogrel 75mg daily, Rasuvastatin Calcium, 20mg, Clonidine hcl 0.3 3 times daily, .81 aspirin.