Trying to budget for my actual monthly treatment cost

I am trying to understand the real monthly cost of my treatment based on the dose I have been prescribed.

I keep seeing different prices mentioned online, but many of them do not include the actual dose, brand, or how long one pack lasts. It makes it difficult to know what someone should realistically expect to spend each month.

For people who have calculated their costs, how do you work it out? Do you mainly look at the medicine price, or do you also include follow-up visits and other expenses?