Ivermectin is poorly water soluble
Best to dilute 1/5 in alcohol
5000 ug/ ml stock, 2 ml with 8 ml alcohol
1000 ug/ ml working
So 0.2 ml is 200 ug per kg (recommended concentration) , 0.4ml for 2 kg, etc
Easier with syringe
More precise than drops
Better coverage
Less risk of overdosing...