Dosing help needed please:

We have children’s liquid Advil - label says 5ml contains 100mg.

The Ivermectin is 1.87% and says the syringe holds enough to treat a 1250lb horse at the recommended dose of 91mcg per lb.

Brutus’ latest weight was 97 grams last night.

Please see other thread (please help - swollen shoulder getting worse) for more info on situation. Apologies for the duplicate post; I wasn’t sure if I am supposed to start a new thread for new questions.

Thank you