That is a question for your vet to answer. Give them a call and ask as well as for a new prescription Lantus. Maybe they even have some Lantus available to sell to you. Some vets keep a few Lantus pens or vials on hand for hospitalized diabetic pets.
I agree with @squeem3 that this is a question for the vet. Do you just happen to have Metformin around the house? More Lantus would be a better solution.
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