Rondec is the brand name of an over-the-counter syrup that contains phenylephrine and chlorpheniramine, both of which work to help relieve allergy and cold symptoms. Phenylephrine helps to ease your breathing by acting as a decongestant in your nasal cavity. Chlorpheniramine functions as an antihistamine, depressing the release of your body's histamine, which can make your nose run, your eyes water and your skin itch, and can cause you to sneeze. Although you may purchase Rondec syrup without a prescription, you should ask your doctor about it first because it may cause some serious side effects.
Vision Problems
The actions of the decongestant and antihistamine combination in Rondec syrup may make it difficult for you to see properly. Specifically, it may cause problems when you try to focus your vision, whether upon near or far objects or people, Drugs.com indicates. This blurring of your normal vision generally vanishes on its own as you use Rondec syrup more because it typically is an initial side effect of the drug. If your vision becomes severely blurred or if it does not clear up, query your physician about the problem. You also may temporarily get a condition known as diplopia in which you see double, overlapping images, RxList.com notes. This, too, should end shortly after starting the medicine.
Tachycardia
The use of Rondec syrup may cause some heart problems that classify as serious. Drugs.com notes that the medication may make your heart go into tachycardia, an accelerated beat mode in which your heartbeats exceed 100 beats each minute. You also may experience an increase in your blood pressure, RxList.com relates. A rapid heartbeat coupled with hypertension could induce a heart attack to occur. Get medical aid immediately if you notice heartbeat changes when taking Rondec syrup.
Mental Problems
When you take Rondec syrup, you may become susceptible to side effects that affect your brain. You may, for example, become confused about everyday things or people you know well. Abnormal thoughts may occur and you may behave oddly. You may even see, hear or feel sensations that are not present. You may feel restless or you may become anxious and nervous. Any or all of these side effects mean you are experiencing serious side effects of the medication. Speak with your doctor immediately.
Gastric Problems
During your initial use of Rondec syrup, it may upset your stomach and intestines. It may cause you to lose your appetite and you may feel nauseous. Pain may occur in your stomach or your abdomen, accompanied by constipation. Side effects of this nature tend to cease on their own.
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