The modern pharmaceutical market offers a huge selection of drugs from allergies. Conventionally, three generations of tablets can be distinguished, which differ not only in their appearance time, but also in their effect on the central nervous system and side effects.
Preparations of the first generation have a relatively low cost, help cope with various manifestations of allergy, but also cause a number of adverse reactions, in particular, decreased reaction, drowsiness, visual impairment, constipation, etc.
Preparations of the second generation are slightly more expensive, but not so much affect the nervous system. The principle of the action of tablets from the second generation allergy is based on the blocking of H1 receptors (other receptors are not affected), in addition, these drugs act faster and longer, in comparison with the previous-generation tablets.
Before taking the tablets, it is recommended to consult a doctor, since each drug has its own drawbacks, in particular, tablets from the second generation allergy, although they do not cause drowsiness and other side effects, can affect the heart rhythm (Eden, Erius, Fenistil, Claritin, etc.) .
Preparations of the third generation contain an active substance (for example, tablets of the second generation in the body break up into a radical and an active substance, and therefore, their action does not begin immediately), cause a minimum of adverse reactions. The main disadvantages of such tablets include high cost and a small selection of drugs. Before taking it is necessary to consult with a specialist, since each drug contains a different active substance and the expediency of taking this or that tool will help to determine only the doctor after a preliminary examination.
Tablets from allergies that do not cause drowsiness of the third generation are used in various conditions, for example, Telfast is indicated in severe cases (Quincke's edema), and Xizal refers to drugs with a wide spectrum of action and is prescribed for different types of allergy.