Yes, you can do this by
1. Removing the currency symbol (calculator settings menu)
-> https://prnt.sc/10wff4w

2. Add the word "mg" beside the total.
-> Use HTML to input a <span> tag beside the total and use the word "mg" or whatever unit the medicine is measured in.
-> https://prnt.sc/10wfjpt

3. Use the slider element and enter the calculator of the person's weight into MG.
->https://prnt.sc/10wfipn

What It Can Look Like