I found that these two words are synonyms shared the same meaning of the amount of a medicine. Can I use both of them in one sentence (e.g. the highest dosage of drug A increased...... while the middle dose did not.)?

Thank you in advance.

I found that these two words are synonyms and share the same meaning: the amount of a medicine. Can I use both of them in the same sentence?

for example:

The highest dosage of drug A increased [...] while the middle dose did not.