Buy Allegra online, an oral, "second generation" antihistamine that is used to treat the signs and symptoms of allergy that are due to histamine. Histamine is a chemical that is accountable for many of the signs and symptoms of allergic reactions, for example, swelling of the lining of the nose, sneezing, and itchy eyes. Histamine is discharged from histamine-storing cells (mast cells) and then attaches to other cells that have receptors for histamine. The binding of the histamine to the receptors causes the cell to be "activated," releasing other chemicals that produce the effects that we associate with allergy, e.g., sneezing. Generic Allegra medication blocks one type of receptor for histamine (the H1 receptor) and thus prevents activation of H1 receptor-containing cells by histamine. Unlike the first generation antihistamines, this medication does not readily enter the brain from the blood, and, therefore, they cause less drowsiness.

Before you are able to order Allegra online, your local doctor must know if you are allergic to it; or if you have any other allergies. Also, tell your local doctor about your medical history, especially of kidney disease. Alcoholic beverages should be limited, as they may intensify drug side effects. Kidney function decays as you grow older. This medication is eliminated by the kidneys. Therefore, the elderly may be more susceptible to the effects of this drug. Generic Allegra medication should be used only when clearly needed during pregnancy, and according to a local physician's instructions. It has not been established whether this drug passes into breast milk. Consult your local doctor before breast-feeding.

You can order cheap Allegra online for protection against hay fever and other similar allergy symptoms. Although this generic medicine is mostly safe, you should be aware of the side effects that it may cause in some cases. Adverse effects include vomiting, nausea, diarrhea, somnolence, fatigue and headache. There have been instances where patients have complained about drowsiness not necessarily due to an overdose. In some cases it may also lead to insomnia, nervousness and some hypersensitivity reactions. Generic Allegra medication may also cause stimulation of the central nervous system leading to restlessness and excitability.

The recommended dose of generic Allegra medication for children above 12 and adults is 60mg two times a day or 180mg every 24 hours with water. People with impaired renal function are normally advised a starting dose of 60mg once daily. For children below 12, the dosage is halved. It's important to keep in mind that this, or any other drug, should never be administered to children without a local doctor's permission. In general, always follow your local physician's prescription after you buy Allegra online.