Allergy Management: A Guide to Choosing Relief Options

In case of allergy symptoms (runny nose, tearing, and eye irritation), as well as urticaria, the number one medication is antihistamines. Here’s what certified pharmacist from Mēness aptieka, Evita LARMANE, says:

– Antihistamines, also known as H1 receptor blockers, have evolved over time, and the subsequent generations have largely surpassed the first in both drug tolerance and suitability for long-term use.

First Generation: A Legacy with Significant Limitations

Popular first-generation medications (e.g., Clemastinum, Chloropyraminum) can effectively and quickly reduce acute symptoms; however, they also create significant limitations — causing not only pronounced drowsiness (sedation) and lethargy but also potentially leading to dry mouth, vision disturbances, and urinary retention, which means the inability to completely or partially empty the bladder. For elderly individuals, such a burden is a critical risk factor associated with cognitive decline and the risk of falls, so they should avoid using first-generation antihistamines.

Second and Third Generations — The Gold Standard of Therapy

For the treatment of allergic rhinitis and chronic spontaneous urticaria, second and third-generation antihistamines are recommended as first-line agents. Research data confirm that they provide equivalent or greater efficacy in controlling symptoms while significantly reducing the risk of drowsiness. However, for those whose profession or daily activities require high concentration, preference within this group of medications is given to those that have demonstrated zero impact on psychomotor abilities.

Particular attention should be paid to the therapy of chronic spontaneous urticaria, considering individual risks. In rare cases, modern antihistamines may interact with specific medications or affect the heart's management system (QT interval), which is especially important for patients with heart diseases or those taking other QT-prolonging agents.

Interactions and Possible Side Effects

An additional burden on the safety of antihistamine therapy arises from interactions with other medications and daily habits.

It should be noted that first-generation antihistamines significantly enhance the effects of sedatives, such as sleeping pills or opioids, and also compound with the effects of alcohol, dangerously slowing reaction times.

Attention should also be paid to new-generation antihistamines. Some of these medications are metabolized in the liver by specific enzymes. Concurrently taken medications that utilize the same metabolic pathways can hinder this process.

For example, in combination with certain antibiotics or antifungal agents, the concentration of antihistamine in the plasma may increase due to the slowed breakdown, raising the risk of unwanted side effects.

Grapefruit Juice? Wait a Couple of Hours!

The effectiveness of antihistamines can even be influenced by everyday nutrition. For instance, grapefruit or orange juice can reduce the absorption of certain antihistamines, along with their clinical effect.

In the case of more modern antihistamines, food and fruit juices can also decrease the bioavailability of the medications, so it is important to maintain an interval of intake — one hour before or two hours after meals.

When choosing an antihistamine, safety is always based on a balance of several factors: the properties of the drug molecule, the dosage form, concurrently taken medications, and the user's daily habits. Understanding these nuances allows for effective symptom control while maintaining good drug tolerance and quality of life.

Desired Side Effects

Although the use of H1 antihistamines is primarily associated with allergic diseases, in certain situations, the properties of first-generation medications, which are considered limiting in other cases, provide the necessary therapeutic benefit. In vestibular disorders and motion sickness (kinetosis), centrally acting agents not only reduce nausea and dizziness but also calm and stabilize the condition. In cases of nausea during pregnancy, this can help control symptoms while providing a mild calming effect.

In acute cases, such as serious and dangerous allergic reactions or anaphylaxis, H1 antihistamines can reduce skin symptoms; however, they in no way replace the necessary adrenaline for improving the condition — in such situations, one should not rely on antihistamines as a rescue medication: immediate access to emergency medical assistance is required.

Dosage Forms and Combinations

H1 antihistamines are available in various dosage forms:

1. Tablets and solutions provide a systemic effect and are especially important in chronic urticaria and allergic rhinitis.

2. Local forms — nasal sprays and eye drops — allow for rapid symptom relief with minimal impact on the entire body.

3. Topical antihistamines — gels, creams — can be used to reduce localized itching, for example, after insect bites or in mild skin allergic reactions. It should be noted that these agents are intended for small areas of skin and are unsuitable for treating extensive dermatitis or chronic urticaria.

Local Therapy for Allergic Rhinitis

One option is nasal sprays that combine H1 antihistamine with a corticosteroid. They provide rapid symptom relief and long-term control of inflammation. The antihistamine quickly reduces swelling and itching, while the corticosteroid suppresses inflammatory processes in the long term.

There are also barrier-type sprays that work mechanically: they form a thin gel-like barrier on the nasal mucosa that traps inhaled allergens, such as pollen and dust mites, and promotes their elimination, preventing contact with cells. They can serve as a preventive measure.

By using various means, treatment can be individually tailored to provide both immediate symptom relief and long-term protection while maintaining safety. Pharmacists at Mēness aptieka are always ready to assist anyone seeking allergy relief options. However, we remind you that consultation with a physician is always important.