Forudgående behandling med antiinflammatoriske substanser kan resultere i yderligere eller forstærkede bivirkninger, og derfor bør der indlægges en behandlingsfri periode på mindst 24 timer, inden behandling påbegyndes.
Pre-treatment with anti-inflammatory substances may result in additional or increased adverse effects and accordingly a treatment-free period with such drugs should be observed for at least 24 hours before commencement of treatment.