Rispoval RS Contra-indications, warnings, etc Do not vaccinate unhealthy animals. Anaphylactic reactions may occasionally occur. Where necessary, appropriate antihistaminic treatment should be instituted. No reactions other than those listed above have been observed following administration of a ten times overdose with Rispoval RS. Withdrawal period: Zero days. Operator warning: In case of accidental self-injection, wash the area immediately with water. If symptoms develop, seek medical attention showing a copy of the package insert.