Duphacycline 100 Contra-indications, warnings, etc FOR ANIMAL TREATMENT ONLY Milk taken from cows during treatment and for a period of 60 hours after treatment must not be used for human consumption. Animals must not be slaughtered for human consumption during treatment. Animals may be slaughtered for human consumption only after 15 days from the last treatment. General toxicity is low although collapse has been reported with tetracycline in weak and debilitated animals. The period between the withdrawal from the container of the first and last doses should not be unduly prolonged.