The normal human heart beats regularly, usually between 60 and 100 beats per minute when a person is inactive. Some heart problems may develop, however, that change the heartbeat in significant ways that cause health problems. When a person has an arrhythmia, particularly an irregular heart rate, the doctor may prescribe a medication with the brand name Tikosyn. This antiarrhythmic medication, generically called dofetilide, helps control the heart rate. It does this by reducing the speed of heart nerve impulses, according to MayoClinic.com.
Arrhythmia
Although Tikosyn works to regulate the heart rate in most people, some people may experience a new or increased arrhythmia when taking the medication. Tikosyn may induce the heart to beat faster than normal---a condition called tachycardia---or it may produce an irregular heartbeat. Both of these arrhythmias, MayoClinic.com says, are serious common side effects of taking the medication that should be reported to a doctor.
Syncope and Dizziness
With the change in heart beat caused by Tikosyn, the body may react to serious common side effects of the drug. Dizziness may be experienced because the blood circulates differently with this medication, causing an imbalance in equilibrium. Dizziness can produce falling, injuries and nausea. Fainting, or syncope, may also occur when taking Tikosyn, according to MayoClinic.com. Both of these problems require medical attention as soon as possible.
Infection
The use of Tikosyn may cause susceptibility respiratory tract infection. This can result in breathing difficulties and a general feeling of being uncomfortable. In most cases, however, this non-serious common side effect will vanish on its own in a day or two, Drugs.com reports.
Headaches and Nausea
Tikosyn also may induce other minor non-serious side effects, especially at the beginning of treatment, Drugs.com states. Headaches may be experienced for two or three days until the body adjusts to the medication. Feelings of nausea during this period might also develop. These problems typically cease on their own without medical help.
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