The Claritin was a separate approach specific for bone pain. The first time I used it I experienced about 75% less bone pain. Considered myself extremely fortunate., We found that women perceived that loratadine was more effective for controlling pegfilgrastim-induced bone pain than NSAIDs, but not better than acetaminophen. Because 65% of women were pain free, we do not know if loratadine was truly effective in prevention or if the women would have been pain free without the use of loratadine., We present the first case report in which loratadine prophylaxis completely alleviated NSAID-resistant severe pain secondary to pegfilgrastim. The result showed that loratadine may be a promising option for severe, resistant pegfilgrastim-induced bone pain. Further clinical studies are warranted and ongoing., In patients with bone pain from filgrastim or pegfilgrastim, use of antihistamines such as loratadine (Claritin®) or cetirizine (Zyrtec®) can help alleviate bone pain in some cases., Pegfilgrastim is a 20-kilodalton polyethylene glycol carrier of filgrastim that is covalently bound at the N-terminal residue. Randomized trials have demonstrated that a single dose of pegfilgrastim offers neutrophil support comparable to multiple once-daily doses of filgrastim (1, 2)., Prophylaxis for FN should include granulocyte colony stimulating factor (G-CSF), given 24 hours following each chemotherapy cycle.² Available G-CSF formulations include filgrastim (Neupogen) and tbo-filgrastim (Granix), which are given in daily injections for up to 14 days, and the long-acting pegfilgrastim (Neulasta), which is given in a .