What are the Common Hydralazine Side Effects?

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  • Written By: Meshell Powell
  • Edited By: Melissa Wiley
  • Last Modified Date: 09 November 2019
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Hydralazine is a prescription medication that is commonly used to treat high blood pressure. While many patients do not experience any negative side effects when taking this medication, it is important to note that there are many potential side effects associated with the use of this medication. Some of the more common hydralazine side effects include headache, heart palpitations, and loss of appetite. Some of the more severe hydralazine side effects may include an allergic reaction, low blood pressure, or psychotic episodes. Any negative side effects should be reported to a doctor for further evaluation.

The most commonly reported hydralazine side effects include nausea, vomiting, and headaches. In some patients, these side effects are mild enough that the patient is able to continue taking the medication. These same side effects may become so severe in other patients that the medication has to be discontinued. A doctor should always be consulted before stopping this medication.

Some of the more common cardiovascular hydralazine side effects include heart palpitations, rapid heartbeat, and low blood pressure. Swelling has been reported as a relatively common side effect as well, especially in the feet, hands, or face. Some patients may also experience respiratory distress or difficulty breathing. Liver damage, including a disease known as hepatitis, has also been linked in some cases to the use of this medication.


Some hydralazine side effects involve the central nervous system. There have been many reports of numbness, tingling, and dizziness. Psychotic episodes have also been reported in some patients. These episodes may involve anxiety, disorientation, or depression. These psychological side effects should be reported right away so that the patient does not risk harm to himself or others.

Difficulty when urinating or abnormal blood test results are possible hydralazine side effects. Nasal congestion is also relatively common when taking this medication. Some people have even developed conjunctivitis, or pinkeye, as a result of taking hydralazine. Fever, chills, and the development of a rash are possible as well.

There is always the risk of an allergic reaction developing when taking any medication. Any questions or concerns should always be addressed with a doctor. If the face or throat begins to swell or there is difficulty breathing, this situation should be considered a medical emergency. In the event of an allergic reaction, the patient will likely spend a day or two in the hospital undergoing intensive medical treatment. An untreated allergic reaction can be a life-threatening situation.


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