New Medications Offer Faster Relief for Eye Allergies
April 25, 2000 -- As pollen season kicks into full gear, doctors have two
new types of prescription eye drops to offer patients with red, itchy eyes
caused by allergies. The two drugs, along with a third type that should be on
drugstore shelves within a few weeks, are easier to use and provide faster pain
relief than older medications, specialists say.
"More than 22 million people in this country have seasonal eye
allergies," William Basuk, MD, an eye disease specialist with Scripps
Memorial Hospital in San Diego, tells WebMD. "Their main complaint is
Red, swollen, itchy eyes are caused by allergic conjunctivitis, which occurs
when the membrane covering the white of the eye and the inside of the eyelid
becomes inflamed. This happens after the membrane comes into contact with dust,
pollen, pet dander, or other airborne allergens -- substances that are
especially prevalent in the spring.
Pharmaceutical companies say the two new drugs -- Alocril, from Allergan
Inc., and Zaditor, from CIBA Vision -- are an improvement over older drugs
because they attack allergic symptoms in two ways instead of one. Most older
drugs are either antihistamines, which block the action of histamine (the
substance that causes itching, burning, redness, and swelling), or mast-cell
stabilizers, which prevent mast cells (a type of blood cell) from releasing
Alocril and Zaditor are both antihistamines and mast-cell stabilizers.
Zaditor also has a third action that helps quell allergic symptoms.
"It makes sense that medications that do both are best, but we have no
solid studies yet that prove that," Basuk says. "But the new ones are
more convenient; you use them twice a day, as opposed to four times a day, and
they provide relief faster than the older drugs. It's pretty horrible to have
to wait two weeks to get relief."
Antihistamines and mast-cell stabilizers were originally developed as
alternatives to steroids, powerful medications that have serious side effects
such as glaucoma, cataracts, and infection. In some cases, doctors will
prescribe steroids for a short period for instant relief, and a newer
medication for long-term use.
"In most cases, the symptoms of ocular allergies are mild to
moderate," Basuk says, "but in a few severe cases, people can lose
their vision. For them, these allergy medications are crucial in saving their
The third new drug, Alamast, by Santen Inc., has been approved by the FDA
and will be available in a few weeks. It is an improved mast-cell stabilizer,
and also comes in drop form.
This drug should be used before symptoms start, because it takes a few days
before the itching stops, Gregg J. Berdy, MD, an eye allergy specialist and
clinical instructor at Washington University School of Medicine in St. Louis,
tells WebMD. He was involved in the clinical testing of Alamast.