Bivirkninger, der rapporteredes med samme hyppighed hos patienter, der fik filgrastim/ kemoterapi og placebo/ kemoterapi, omfattede kvalme og opkastning, alopeci, diarré, træthed, anoreksi, mukosit, hovedpine, hoste, hududslæt, brystsmerter, almen svækkelse, ondt i halsen, forstoppelse og uspecificerede smerter.
Undesirable effects reported with equal frequency in patients treated with filgrastim/ chemotherapy and placebo/ chemotherapy included nausea and vomiting, alopecia, diarrhoea, fatigue, anorexia, mucositis, headache, cough, skin rash, chest pain, generalised weakness, sore throat, constipation and unspecified pain.