30min- 1hr after. To minimize the chance of vomiting only

after 2 hrs

since your pup is a labrador. According to trusted sources it's around 1hr. hope that helps

Give him time and feed him after a hour

After 1 hours.

after one hour

After 30min. - 1hour Deworming is most Effective when done on an Empty Stomach. So if you want the medicine to kill the worms, take it on an empty stomach.