Yes you can take them together. they act through different mechanisms in the body. Viagra works on strictly bloodflow to the penis so you get an erection no matter what. Cialis works through the brain. With Cialis you won't get an erection without sexual stimulation. I have mixed them both and they have a synergistic effect. Combine normal dosages of each one and you will have an unbelievable super erection. I can back this up. It is the truth.
Just make sure you have 3-4 chicks lined up or one who is seriously ready to take the most severe pounding of her life. lol. If you are on test and/or any stimulants. She's a goner bro...
Disclaimer: This is for informational purposes only. I am not held liable or responsible for anything that may happen as a result doing this.