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Signs of a severe allergic reaction (anaphylaxis) include: Skin rash, hives, or severe itching Swelling of the face, lips, tongue, or throat Difficulty breathing or wheezing A rapid heartbeat or a sudden drop in blood pressure If you ever develop swelling of the face or throat, trouble breathing, or other signs of a severe reaction after any injection, treat it as an emergency and call 911

There is no strong evidence suggesting gender-specific risks, but safety data is limited for both men and women

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Nasal sprays work fast too, by being absorbed through your nose