Your best bet, is to contact a vet and ask them about it.... They will need to know the dogs age, weight, and how much of the medications they might have ingested. Basically, all the same questions Jerry is asking. If you can't contact a vet, you can try contacting the pet poison helpline. Below is a website and their phone number. Maybe they can help you. .
Also as Jerry has asked...are they exhibiting any unusual behaviors...? If these were my dogs, I would be trying my hardest to contact a vet ... even if it is after hours.
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