Whilst Cialis and Viagra work on different rhythms, their effectiveness in ED treatment is pretty much identical. Benign prostatic hypertrophy is a condition in which the prostate gland becomes enlarged, obstructing the free flow of urine. Ask your doctor if you are not sure whether any of your medications contain nitrates. Key Takeaways… So, Cialis vs Viagra — who won? One thing to consider in deciding between Cialis and Viagra, however, is that Viagra is affected by the foods you eat.Cialis: A prescription of 30 Cialis pills costs $ Tadalafil: 30 tadalafil pills are available for $ PlushCare also works with several health insurance providers. Side Effects. Headache, stomach upset, back pain, muscle pain, stuffy nose, flushing, or dizziness may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. To. While the manufacturer suggests that a day supply of daily Cialis should cost about the same as eight pills of hour Cialis a month, there’s no way to enforce this. Check your insurance policy and local pharmacies for price information. – By Matthew Solan Executive Editor, Harvard Men’s Health Watch. Image: yacobchuk/Getty Images.