Can fish be double dosed with General Cure / Paracleans?

[Patrick M. Bodega Aquatics]

Hello everyone,

My neighbor bought a small aquarium with a betta half a year ago. She wormed it once with General Cure but didn't follow up later. She wanted to get a few tetras but was wondering If she should completely redo her betta deworming. Is this safe or would double dosing be bad?

[Ken Dyer]

Should be fine, I typically want to deworm twice for many kinds of fish anyway. Like any meds they can be hard on your fish so I wouldn't want to keep adding fish and deworming each time in a community tank but 1 course of deworming following the directions on the package shouldn't be too much.