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Have found information on this on a heart medication site (atenolol)(for arrythmia, high blood pressures, etc.) - Quote: Patients with hypersensitivity to stings and antigens may find that their reaction to stings, etc. is increased. Therefore causing a greater incidence of anaphylactic shock Unquote. I personally have had an amazing reaction to a couple of wasp bites since I have been on this medication - pain, tremendous swelling, a sort of blood blister under the skin, etc. and was curious about the connection.