Antihistamines

If something triggers an allergic reaction in your body, your immune system releases a chemical messenger called histamine. Histamine causes allergy symptoms like sneezing, watery eyes and rashes. Antihistamines suppress this effect. When treating allergic rhinitis, antihistamines can be used in the form of tablets or nasal sprays. Tablets start working within one hour, and nasal sprays start working within 15 minutes.

Research has shown that tablets and nasal sprays can both provide relief. They are usually well tolerated. The most common side effects of tablets are tiredness and headaches. They can make it more difficult to drive a car and do other activities. How tired you feel may also depend on the specific medication. So it's important to follow the instructions in the package insert and find out about the various kinds of medications beforehand. Nasal sprays can leave a bitter taste in your mouth.

Steroids (corticosteroids)

Corticosteroids are steroid drugs that contain an anti-inflammatory steroid hormone. Steroid nasal sprays reduce reduce swelling in the mucous membranes and relieve symptoms like a runny or stuffy nose. Because only a small amount of the steroid medication enters the bloodstream when you use a nasal spray, they are considered to be low-risk. They can be used over longer periods of time, but it is then advisable to see a doctor regularly for check-ups.

Although steroid nasal sprays don’t have an immediate effect, people usually notice a difference within twelve hours. The full effect is reached after a few days. They might cause mild side effects such as nosebleeds, headaches or altered taste.

Combination products

Some nasal sprays contain both an antihistamine and a steroid. This combination is more effective than a treatment with just one of the drugs. It's a suitable option if treatment with one medication doesn't provide enough relief from the symptoms.

Unlike many of the products that just have one drug, combination nasal sprays are prescription-only.

Leukotriene receptor antagonists

These medications block the action of leukotrienes. Leukotrienes are chemical messengers that play an important role in the inflammatory response that happens in the airways. In addition to relieving asthma symptoms, they can also relieve the symptoms caused by hay fever – but not as well as antihistamine or steroid nasal sprays do. Leukotriene receptor antagonists are usually well tolerated. Sometimes they cause temporary side effects such as tiredness or headaches.

Chromones (mast cell stabilizers)

Mast cell stabilizers prevent histamine from being released by certain cells in the body known as mast cells. This reduces allergic and inflammatory responses in the body. They are used in the form of nasal sprays, and are usually used to prevent symptoms, but they can also relieve symptoms. Possible side effects include irritation of the membranes lining the nose, and an unpleasant taste in your mouth.

Decongestant (anti-swelling) nose drops and nasal sprays

Decongestant nose drops and nasal sprays reduce swelling in the membranes lining the nose and the sinuses, making it easier to breathe through your nose. They are not suitable for the long-term treatment of allergic rhinitis, though. Although they open your nasal passages and make it easier to breathe, your nose might “get used to“ them after a short while, and then they have the opposite effect: The membranes become swollen again and it’s difficult to breathe through your nose. These medications can also cause side effects like nosebleeds. So it is recommended that these medications not be used for longer than 5 to 7 days.