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What causes dizziness while taking blood pressure medicine?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hello doctor,

I have been diagnosed with hypertension that developed during pregnancy, and I am currently on medication for it. The prescribed medicines are Nifedipine 30 milligrams and Labetalol (Trandate) 400 mg. Lately, I have been feeling very light-headed and almost fainting after taking these medications. I would like to understand why this might be happening and if it is a common side effect or something that needs further attention.

Kindly advise.

Answered by Dr. Georges Hany Kozah

Education:

MD

Professional Bio:

Dr. Georges Hany Kozah is an experienced Lebanese Gynecologist with an MD from The Lebanese University Faculty of Medical Sciences (2016) and a Fellowship completed in 2022. Specializing in high-risk obstetrics, advanced ultrasound, oncology, colposcopy, and hysteroscopy, he combines expertise with a patient-centered approach. Passionate about women’s health, Dr. Kozah strives for excellence and optimal outcomes in collaborative, innovative care.

This doctor is not available for online consultations on the platform anymore.

Hello,

Welcome to icliniq.com.

I understand your concern.

What you are experiencing is serious and requires careful medical attention. You are currently taking both Labetalol (Trandate) (400 milligrams) and Nifedipine (Procardia) (30 mg), which are potent medications for managing high blood pressure. The symptoms you've described, lightheadedness, near-fainting, chest tightness, and headaches, may be due to your blood pressure dropping too low. Both medications lower blood pressure, and when taken together, they can lead to hypotension, resulting in dizziness, fainting, chest discomfort, blurred vision, or general weakness. Additionally, Labetalol can slow your heart rate, and if your pulse is already on the lower side, this may worsen your symptoms. Timing and possible interactions between the medications might also play a role, especially if taken too close together. Dehydration or anemia, particularly if you're postpartum or have had blood loss, could further aggravate the lightheadedness.

It is important that you see your doctor or visit urgent care as soon as possible. They will need to check your blood pressure and heart rate, and possibly adjust your medication dosage or schedule. They may also check for anemia or electrolyte imbalances. If it is safe, try to monitor your blood pressure and heart rate at home, especially when you feel dizzy. Note if your BP is under 100/60 mmHg (millimeters of mercury) or your heart rate falls below 60 bpm (beats per minute). Also, let your doctor know what time you take your medications, whether the symptoms appear shortly afterward, and if lying down improves how you feel. Feeling faint or actually fainting on these medications is not normal, and your treatment may need adjustment, but only a healthcare provider should make that decision. If you'd like, I can also help you prepare a list of questions or notes for your doctor’s visit.

I hope you are satisfied with my answer. For further queries, you can consult me at iCliniq.

Thank you.

Medically reviewed by iCliniq medical review team
Published At June 10, 2025
Reviewed At March 19, 2026

Education:

MD

Professional Bio:

Dr. Georges Hany Kozah is an experienced Lebanese Gynecologist with an MD from The Lebanese University Faculty of Medical Sciences (2016) and a Fellowship completed in 2022. Specializing in high-risk obstetrics, advanced ultrasound, oncology, colposcopy, and hysteroscopy, he combines expertise with a patient-centered approach. Passionate about women’s health, Dr. Kozah strives for excellence and optimal outcomes in collaborative, innovative care.

This doctor is not available for online consultations on the platform anymore.

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Feeling dizzy on blood pressure medicine?

Five quick questions help you understand potential causes of dizziness while on blood pressure medication and when to contact your doctor.

For guidance only, not a diagnosis. Always consult your doctor for medical advice.

Education:

MD

Professional Bio:

Dr. Georges Hany Kozah is an experienced Lebanese Gynecologist with an MD from The Lebanese University Faculty of Medical Sciences (2016) and a Fellowship completed in 2022. Specializing in high-risk obstetrics, advanced ultrasound, oncology, colposcopy, and hysteroscopy, he combines expertise with a patient-centered approach. Passionate about women’s health, Dr. Kozah strives for excellence and optimal outcomes in collaborative, innovative care.

This doctor is not available for online consultations on the platform anymore.

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