Based on the studies done by the researches, Side effects associated with the medication of Allegra are evident. Some of the commonly associated side effects with this medication include leg or arm pain, indigestion, drowsiness, dizziness, fever, middle ear infection, back pain, fatigue, respiratory infections, diarrhea, cough and headache.    These side effects are generally mild in nature.
They do not require any medical attention. However, if these side effects persist or become bothersome you must consult your health care provider immediately. Many patients do not even experience any side effects with this medication. The occurrence of these side effects generally happens in the initial phase of the medication.  The body tries to adjust with the medication during this period. They usually go away with the advancement of the medication.
There are also some rare side effects that are associated with this medication. These side effects are serious in nature and should be immediately reported to the health care provider. These side effects include difficult breathing, swelling of lips, throat or mouth, nervousness, unexplained rash, painful menstrual period and insomnia. This medication can also have some serious allergic side effects. Allergic side effects are very rare in nature and dangerous. The medication should be immediately stopped and reported to the health care provider.

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