Talk to Dermatologist on Minoxidil Spray

assalam o Alaikum wrwb! after my hair transplant, I'm using minoxidil 5% spray as per my doctor recommendation. but when I bought it for the second time, the brand was different and it was expensive too. does it really make a difference if the brand is different? does it contain some extra vitamins or something due to which it's more expensive? which brand can I buy? please suggest the one which is not so expensive yet very effective. I first time used hairmax minoxidil. which one should I buy now..?