The medication sold as clemastine fumarate is used for the treatment of allergies with such symptoms as a runny nose, sneezing, itching of the nose and throat, watery eyes, cough and other upper respiratory problems. This medication is an antihistamine and works by the blocking action of histamine, which is a substance in the body that causes these types of symptoms, Drugs.com reports.
Dizziness
A common and non-serious side effect of clemastine fumarate is dizziness, a sensation of motion, particularly as if the person experiencing it is whirling around. There are a great number of medications that can cause dizziness when they first are introduced into a person's body. The sensation is uncomfortable and may cause her to lose her balance and fall. She also may become nauseous while dizzy and need to vomit. If the condition lasts longer than a few days she should seek help from her doctor for it, Drugs.com recommends.
Dryness
Clemastine fumarate may cause an uncomfortable but temporary dryness in the user's nose, throat and mouth. These problems usually are minor and only continue a day or two when someone first begins taking clemastine fumarate. He may feel his mouth is excessively dry, as if it contained cotton balls. There is a lack of saliva production that clemastine fumarate can cause. This, coupled with throat dryness, may make it difficult for him to swallow food. Dryness in his nose may make it feel sore.
Excitability
The action of clemastine fumarate in the person's body can cause a brief flareup of excitability when she starts taking it. She may be easily excited or speak with fervor that may be an overreaction to her circumstances. The National Institutes of Health reports this may occur more often in children than in adults who take clemastine fumarate. Again, this type of side effect is not considered to be serious, Drugs.com states, and should end in a few days.
Low Blood Pressure and Tachycardia
Clemastine fumarate also may cause adverse side effects that affect the person's heart. Two of the most common of these problems are contradictory, so they may not happen at the same time. The person taking this drug may find himself with a sudden drop in his blood pressure called hypotension. This may make him feel shaky or sluggish, and it may cause mental confusion because without sufficient blood pressure, not enough oxygen may reach his brain. The contrary side effect, RxList.com states, is tachycardia or an increased heart rate. This may causes nervousness, heart palpitations and, without treatment, can lead to a heart attack.
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