Strange behaviour after de-worming tablet

This morning I put a de-worming tablet supplied by the vet, in my 14/15 month old boys food. Today while i was at work, he cried alot and threw up a couple of times. (I know this as my mum babysat today )

Now tonight hes constantly wanting out side. He is an inside dog and is now lying on the floor crying and has been for the last hour. I have given him attention, given him food and a ball, yet hes not interested.

Usually he cries when he wants attention or outside, but this over the top! Would this be from his tablet this morning? Has anyone elses pets acted funny after a visit to the vet or after de-worming tablets.

What type/brand of tablet did you use ? This does sound like a strange reaction to have to it. Have you informed the vet ?

Has he had these wormers before?

I have had my dogs go off food and be sick following worming. Maybe hes just feeling a bit uncomfortable and out of sorts. I have switched to drontal now which seems to stop these side effects.

But Drontal doesn't cover lungworm.