Is hair shedding possible by switching minoxidil to lower dose?

hi docters! im 22 years old male from india and have been using finasteride for 1.5 years and recently started(3 months ago) using dr reddys mintop 10 and having irritation on forehead and above ears also severe itching on scalp(tried nizoral too) had faced some sleepless nights so by reading forums i am planning to switch rogaine foam 5% as it not contain propelyne glycol so my question is my hair will fall again as it is foam and also lower concentration advance thanks for the replies