Shelled is fine.
Panacur is usually pretty good but has a 7 day withdrawl.
https://www.msd-animal-health.co.za/products/panacur__4__powder/020_product_details.aspx
https://www.allthingsbunnies.com/Panacur-Rabbit-18-75-Oral-Paste-p/med124.htm
But why are you de-worming? Have you seen worms in their poop? Blood? Diarrhea? Personally I have never had to de-worm a rabbit.
If you need something as a regular "just in case" option, feed your rabbits some pumpkin seeds as a natural defense against them.
Panacur is usually pretty good but has a 7 day withdrawl.
https://www.msd-animal-health.co.za/products/panacur__4__powder/020_product_details.aspx
https://www.allthingsbunnies.com/Panacur-Rabbit-18-75-Oral-Paste-p/med124.htm
But why are you de-worming? Have you seen worms in their poop? Blood? Diarrhea? Personally I have never had to de-worm a rabbit.
If you need something as a regular "just in case" option, feed your rabbits some pumpkin seeds as a natural defense against them.