Hypersensitivity Reactions: If a serious hypersensitivity reaction occurs, discontinue UBRELVY and initiate appropriate therapy. Severe hypersensitivity reactions have included anaphylaxis and dyspnea. These reactions can occur within minutes, hours, or days after administration. Hypertension: New-onset or worsening of pre-existing hypertension may occur. Raynaud’s phenomenon: New-onset or worsening of pre-existing Raynaud’s phenomenon may occur. 5.1 Hypersensitivity Reactions Hypersensitivity reactions, including anaphylaxis, dyspnea, facial or throat edema, rash, urticaria, and pruritus, have been reported with use of UBRELVY. Hypersensitivity reactions can occur minutes, hours, or days after administration. Most reactions occurred within hours after dosing and were not serious, and some reactions led to discontinuation.