Allergy medications are now very popular. They are used to prevent and eliminate all types of allergic reactions that occur in the human body. But the independent use of these drugs can not eliminate the symptoms of such a pathological process. Even the best allergy medicine will not save the situation if the allergen continues to enter the body. 
According to doctors, in the treatment of allergies, it is necessary to adhere to a certain plan of therapeutic measures. First of all, they include the complete cessation or restriction of the intake of the allergen in the body: wet cleaning of the room, cessation of contact with pets, plants, exclusion of certain foods from the diet (citrus fruits, coffee, milk, chocolate, sweets), reduction to a minimum of any physical and mental stress and all irritating factors (among them overheating, overdrying, hypothermia, overmoistening). Allergy medications will work if you follow these rules, otherwise you won’t achieve the desired result.
Modern medicine recommends the use of drugs for the treatment of allergies, which belong to the following groups: 
1. Antihistamines - drugs that prevent the release of histamine.
2. Mast cell stabilizers - medicines that reduce the excitability of cells, which are responsible for the development of allergies.
3. Glucocorticoid hormones with a systemic effect.
Allergy medications belonging to the first group are used to suppress the production of histamine and decrease the sensitivity to peripheral tissue receptor allergic mediators. Thanks to this, allergic manifestations are eliminated very quickly. This effect is exerted by first-generation antihistamines. These include the following: Diphenhydramine, Dibazole, Suprastin, Tavegil, Erius, Citrine, Claritin, Loratidine. They are taken several times a day at regular intervals. The course of treatment is prescribed only by a doctor. 
Almost all such allergy medications are prohibited for pregnant women. They can cause various pathologies in the fetus.
For children, antiallergic drugs are available in a convenient form in the form of drops and syrup.
There are also second and third generation drugs. They act a little differently. They affect histamine receptors in such a way that even with a very high level of histamine in the blood, an allergy simply cannot develop. New allergy medications have one big plus - they should be taken once a day. In addition, they do not produce a sedative effect, which compares them favorably with drugs of the old development.
Any medicine should be taken under the strict supervision of a physician. Only a qualified specialist can determine the required dose and develop a treatment plan. Do not self-medicate in any case.