Hydralazine (Oral Route)

Side Effects

Drug information provided by: Merative, Micromedex®

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

More common

1. Arm, back, or jaw pain
2. chest pain or discomfort
3. chest tightness or heaviness
4. fast, pounding, or irregular heartbeat or pulse
5. nausea
6. shortness of breath
7. sweating

Less common

1. Black, tarry stools
2. blindness or vision changes
3. blisters on the skin
4. blurred vision
5. burning of the face or mouth
6. burning, crawling, itching, numbness, painful, prickling, "pins and needles", or tingling feelings
7. chills
8. clumsiness or unsteadiness
9. confusion
10. cough
11. difficult or labored breathing
12. dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
13. fever and sore throat
14. general feeling of discomfort or illness or weakness
15. joint pain
16. lower back or side pain
17. muscle pain
18. numbness, tingling, pain, or weakness in the hands or feet
19. painful or difficult urination
20. pale skin
21. shakiness in the legs, arms, hands, or feet
22. skin rash or itching
23. swelling of the feet or lower legs
24. swollen, painful, or tender lymph glands in the neck, armpit, or groin
25. tightness in the chest
26. trembling or shaking of the hands or feet
27. ulcers, sores, or white spots in the mouth
28. unusual bleeding or bruising
29. unusual tiredness or weakness
30. weakness in hands or feet

Rare

1. Dark urine
2. light-colored stools
3. upper right abdominal or stomach pain
4. yellow eyes and skin

Get emergency help immediately if any of the following symptoms of overdose occur:

Symptoms of overdose

1. Feeling of warmth
2. headache
3. redness of the face, neck, arms, and occasionally, upper chest

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

1. Diarrhea
2. loss of appetite
3. weight loss

Less common

1. Constipation
2. difficulty with moving
3. dizziness
4. feeling anxious or depressed
5. muscle cramps, pain, or stiffness
6. pain in the joints
7. rash, hives, welts, or itching
8. stuffy nose
9. watery eyes

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

• Precautions

Portions of this document last updated: Feb. 01, 2024

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