With the new DAA medications for Hepatitis C well over 90% of patients achieve cure with their first treatment.
Sadly some patients relapse and we need to consider retreatment. You will find more on why treatment sometimes fails here: https://fixhepc.com.au/blog/item/118-why-does-hepatitis-c-treatment-fail-sometimes.html
In the unfortunate event retreatment is required Gilead Vosevi can be supplied for retreatment for $3000 USD total.