- The second infusion consists of rituximab 1000mg intravenous infusion on day 1 and day 15 as before and the same protocol of followed up every 4 weeks up to 52 weeks from the day of the first infusion.14 Premedication as standard prescription (consists of methylprednisolone 100mg IV, Chlorpheniramine maleate(piriton) 10mg IV and oral paracetamol 500mg to be given 30 minutes before each infusion of rituximab.