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Usually, PPD reactions aren't as severe as O'Dell's.

A woman’s allergic reaction to a hair dye chemical left her blind for 24 hours. The common allergen can also cause rashes and burning sensations...

Steph O'Dell's face became swollen just hours after contact with the dye. She needed steroids at the hospital to stop the reaction.
Epinephrine is injected in the upper thigh using an auto-injector syringe as an emergency treatment for an acute allergic reaction to food or insect stings.

People rely on the EpiPen in life-or-death situations, but the devices are remarkably hard to test. Here’s why.

Testing lifesaving EpiPens before they get to patients is challenging because testing destroys them, according to the EpiPen's manufacturer.

EpiPens weren’t working. It took 3 years and the FDA stepping in before serious change — with potentially deadly outcomes

Consumer complaints about EpiPens were increasing, but its manufacturer wasn’t properly looking into those complaints, FDA inspectors warned in 2014.
A new product from Novartis' Sandoz is set to launch in the first quarter of 2019 and compete directly with Mylan's EpiPen and other products.

Drug giant Novartis is gearing up to release a cheaper EpiPen rival, but one big factor may make competition tricky

The Thursday announcement shows an end in sight for the 17-month saga that has stretched since Symjepi was first approved by U.S. regulators.
Estelle, left after the allergic reaction, and right, as she normally looks.

A French woman says her head ballooned in size after suffering an allergic reaction to hair dye

In the hours and days after applying the hair dye, Estelle's scalp started to itch and then her head started to swell.
An FDA laboratory worker injects an influenza virus into an egg, where it will grow before being harvested.

New guidelines say the flu shot is safe for even more people — including those with egg allergies

Health experts in the US and Canada say flu shots are now considered safe for patients with severe egg allergies, even though the vaccines are grown in eggs.

The tick that makes people allergic to red meat with one bite seems to be spreading

The symptoms are severe, with hives and shortness of breath being common and a dangerous anaphylactic reaction possible, but they seem to appear out of the blue.