Isosorbide Dinitrate-Hydralazine
In StockIsosorbide Dinitrate–Hydralazine is a prescription medicine used to treat heart failure, particularly in patients who need additional support for heart function. It works by combining two vasodilators that help relax and widen blood vessels, improving blood flow and reducing the workload on the heart. This action supports better circulation and symptom management. Use as directed on the product label or by a healthcare professional.
What is Isosorbide Dinitrate–Hydralazine?
Isosorbide dinitrate–hydralazine is a prescription combination medication used to treat certain types of heart failure. It contains two active ingredients:
Isosorbide dinitrate – a nitrate (vasodilator)
Hydralazine – a directacting vasodilator
This combination is commonly prescribed for:
Heart failure with reduced ejection fraction (HFrEF)
Patients who remain symptomatic despite standard therapy
Certain populations where clinical benefit has been established
Available Forms and Strengths
This medication is typically available as:
Oral tablets
Fixeddose combination tablets may come in specific strengths depending on the manufacturer. Individual components may also be prescribed separately.
It is not available as an injection, cream, or capsule in combination form.
What is the Recommended Dosage of Isosorbide Dinitrate–Hydralazine?
The appropriate dose depends on:
Severity of heart failure
Blood pressure levels
Kidney and liver function
Age
Tolerance to medication
It is usually taken by mouth multiple times per day, as directed by a licensed medical specialist.
Treatment often begins at a lower dose and may be gradually increased to reduce side effects such as headache or dizziness.
Because this medication directly affects blood pressure and heart function, dosing must strictly follow the instructions of a cardiologist or other qualified medical specialist.
Do not stop or adjust the dose without medical supervision.
How Isosorbide Dinitrate–Hydralazine Works
This medication works by relaxing blood vessels in two different ways:
Isosorbide dinitrate relaxes veins, reducing the amount of blood returning to the heart.
Hydralazine relaxes arteries, lowering resistance in blood vessels.
Together, they:
Decrease the workload of the heart
Improve blood flow
Help relieve symptoms such as shortness of breath
This treatment helps manage heart failure symptoms. It does not cure heart failure, but it may improve quality of life and reduce hospitalizations when used appropriately.
Is a Prescription Required to Buy Isosorbide Dinitrate–Hydralazine Online?
Yes. This is a prescriptiononly medication.
It should only be used under the supervision of a:
Cardiologist
Internal medicine specialist
Primary care physician experienced in heart failure management
Because improper use may cause dangerously low blood pressure or other complications, medical oversight is essential.
Patients should:
Avoid websites that sell prescription drugs without requiring a prescription
Purchase only from licensed and regulated pharmacies
Avoid counterfeit or improperly labeled products
Veterinary products should never be used in place of human medication.
Side Effects of Isosorbide Dinitrate–Hydralazine
Common Side Effects
These are often mild and may improve with time:
Headache
Dizziness
Low blood pressure
Flushing
Fast heartbeat
Nausea
Headaches are especially common with nitrate medications.
Serious Side Effects
Seek immediate medical attention if you experience:
Severe dizziness or fainting
Chest pain that worsens
Very fast or irregular heartbeat
Swelling of the face or throat
Signs of a lupuslike reaction (joint pain, rash, fever – associated with hydralazine)
Any new or worsening heart failure symptoms should be reported promptly.
Drug Interactions
This medication can interact with several types of drugs.
Heart and Blood Pressure Medications
Other antihypertensives
ACE inhibitors
ARBs
Betablockers
Diuretics
These combinations may increase the risk of low blood pressure.
Erectile Dysfunction Medications
Drugs such as sildenafil, tadalafil, or vardenafil must not be used with nitrates. This combination can cause lifethreatening drops in blood pressure.
OvertheCounter (OTC) Products
Cold medications containing decongestants
Certain herbal stimulants
Supplements and Herbal Products
Always inform your healthcare provider about:
Herbal supplements
Vitamins
Nonprescription medications
A full medication list should be shared with your licensed medical specialist before starting treatment.
Safety & Important Considerations
Low Blood Pressure
This medication can significantly lower blood pressure. Monitoring is important, especially during dose adjustments.
Kidney or Liver Disease
Dose adjustments or careful monitoring may be required.
LupusLike Syndrome
Hydralazine has been associated with a rare autoimmune reaction resembling lupus. Symptoms include joint pain, rash, and fever.
Pregnancy and Breastfeeding
Discuss risks and benefits with a licensed medical specialist before use during pregnancy or breastfeeding.
Older Adults
Older patients may be more sensitive to blood pressure changes and dizziness.
Monitoring
Monitoring may include:
Blood pressure checks
Heart rate monitoring
Symptom tracking
Periodic lab testing if indicated
Who This Medication Is For
Isosorbide dinitrate–hydralazine is typically prescribed for:
Adults with heart failure and reduced ejection fraction
Patients who cannot tolerate certain firstline medications
Patients requiring additional therapy for symptom control
It is used as part of a comprehensive heart failure treatment plan.
Who Should Not Take Isosorbide Dinitrate–Hydralazine
This medication may not be suitable for individuals with:
Severe low blood pressure
Cardiogenic shock
Allergy to nitrates or hydralazine
Concurrent use of phosphodiesterase5 (PDE5) inhibitors
Caution is required in patients with:
Severe anemia
Recent heart attack
Significant kidney or liver disease
What to Do If You Miss a Dose
If you miss a dose:
Take it as soon as you remember.
If it is close to your next dose, skip the missed dose.
Do not double the dose.
If unsure, contact your licensed medical specialist for guidance.
Alternatives to Isosorbide Dinitrate–Hydralazine
Other medications used in heart failure management include:
ACE inhibitors
Angiotensin receptor blockers (ARBs)
Angiotensin receptor–neprilysin inhibitors (ARNIs)
Betablockers
Mineralocorticoid receptor antagonists
Treatment selection depends on the patient’s medical history and response to therapy. Any changes should be made only after consultation with a cardiologist.
Storage Instructions
Store at room temperature.
Keep away from moisture and direct light.
Do not store in the bathroom.
Keep out of reach of children and pets.
Do not use expired medication.
Disclaimer:
This page is for educational purposes only.
It is not a substitute for professional medical advice, diagnosis, or treatment.
Patients must consult a licensed cardiologist or other qualified medical specialist before starting, changing, or stopping Isosorbide dinitrate–hydralazine. Treatment decisions must be based on a full clinical evaluation by a qualified specialist.