Is it ok to take tadalafil (cialis) with l-arginine?

[Supreme666leader]

I read mixed things on this online, some links say its bad as it can lower blood pressure too much, other studies seemed to show it being safe or even more effective. I like the optimum amino energy drink and the full serving has 5g of the aminos but not sure how much l arginine and citrulline is actually in that serving. Ive recently been trying low dose 5mg of cialis before the gym only on gym days and it seems pretty good but would this combo in the same day be unsafe?

Thank you.