Forgastrin Oral Powder Contra-indications, warnings, etc If the condition fails to improve after 48 hours, consult a veterinary surgeon. Do not administer at the same time as other oral drug therapy. Operator warnings: In the event of accidental eye contact, rinse the eye with plenty of clean water. Wash exposed areas with soap and water after use of the product. General precautions: For animal treatment only. Withdrawal period: Cattle meat - zero days. Cattle milk - zero hours. Pig meat - zero days.