After 25mg the side effects / effect ration worsen more and more. While the side effects increase exponentially with the higher dosage, the effects of Ostarine doesn't increase more (natural logarithm ln(x)).
That your friend is running 180mg/ed Ostarine is nearly impossible. This product can't be Ostarine or it's an inactive R-isomer of Ostarine. It's not possible, trust me.
And this "a friend of mine"-discussions are always senseless. A friend of a friend is also running some couple of grams test per week for better crossfit achievements *irony*.