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Vaseretic

Vaseretic: Enalapril and Hydrochlorothiazide Combination Overview

Vaseretic contains the active ingredients enalapril and hydrochlorothiazide. It belongs to the heart and blood-pressure therapeutic class and is supplied as a pill in a fixed-dose of 10 mg enalapril combined with 25 mg hydrochlorothiazide. In Hong Kong the product is available only by prescription and is regulated by the Pharmacy and Poisons Board under the Department of Health.

How Vaseretic Works in the Body

Enalapril is an angiotensin-converting enzyme (ACE) inhibitor. By blocking ACE, it reduces the formation of angiotensin II, a hormone that narrows blood vessels. This leads to vasodilation, lower peripheral resistance, and reduced blood pressure.

Hydrochlorothiazide is a thiazide-type diuretic. It acts on the distal convoluted tubule of the kidney, promoting the excretion of sodium and water while increasing calcium reabsorption. The resulting decrease in plasma volume complements the vasodilatory effect of enalapril, producing an additive blood-pressure-lowering effect.

Together, the two agents begin to work within a few hours after the first dose, with the full antihypertensive effect typically reached after 2-4 weeks of consistent therapy.

Conditions Treated by Vaseretic

Vaseretic is approved in Hong Kong for the treatment of hypertension (high blood pressure) when monotherapy with either component alone is insufficient. The combination is especially useful in patients who need both vasodilation and modest fluid reduction to achieve target blood-pressure goals.

Typical patients include adults with essential hypertension, including those with early signs of target-organ damage such as left-ventricular hypertrophy or microalbuminuria.

Who Should and Should Not Use Vaseretic?

Ideal Patient Characteristics

• Adults with diagnosed essential hypertension
• Individuals whose blood-pressure goals are not met with a single-agent regimen
• Patients who can safely tolerate both an ACE inhibitor and a thiazide diuretic

Absolute Contraindications

• Known hypersensitivity to enalapril, hydrochlorothiazide, or any component of the tablet
• History of angio-edema related to ACE-inhibitor therapy
• Severe renal impairment (eGFR < 30 mL/min/1.73 m²) when combined with a thiazide diuretic
• Pregnancy (risk of fetal renal toxicity and skull hypoplasia)

Relative Contraindications and Cautions

• Moderate renal impairment (eGFR 30-59 mL/min/1.73 m²); dose adjustment may be required
• Hepatic impairment, especially biliary cirrhosis, which can increase enalapril levels
• Hyperkalemia or conditions predisposing to high potassium (e.g., use of potassium-sparing diuretics, supplements)
• Gout, because thiazides can increase serum uric acid
• Diabetes mellitus, due to potential effects on blood-glucose control

Special Populations

• Pregnancy/Lactation: Contraindicated in pregnancy; breastfeeding mothers should avoid use.
• Elderly: Start at the usual dose but monitor renal function and electrolytes closely.
• Pediatric: Not indicated for children; safety and efficacy have not been established.

Safety Profile: Side Effects and Interactions

Common Side Effects

• Cough (dry, persistent) - reported in a minority of patients taking ACE inhibitors
• Dizziness or light-headedness, especially after the first dose or when standing up quickly (orthostatic hypotension)
• Increased urinary frequency due to the diuretic action
• Mild electrolyte disturbances, such as low potassium (hypokalemia) or low sodium (hyponatremia)

Most of these effects are mild and often improve with continued therapy or simple lifestyle adjustments (e.g., rising slowly from seated positions).

Serious Adverse Events

• Angio-edema: swelling of the face, lips, tongue, or airway; requires immediate medical attention
• Severe hyperkalemia: can cause cardiac arrhythmias; monitor serum potassium, especially if other potassium-raising agents are used
• Acute kidney injury: marked rise in serum creatinine after initiation; assess renal function within 1-2 weeks of starting therapy

Drug Interactions

• Major:

• Lithium: thiazide diuretics reduce lithium clearance, raising the risk of toxicity.

• Potassium-sparing diuretics or supplements: additive risk of hyperkalemia.

• Non-steroidal anti-inflammatory drugs (NSAIDs): may blunt antihypertensive effect and worsen renal function.

• Moderate:

• Other antihypertensives (beta-blockers, calcium channel blockers): may enhance blood-pressure lowering; dose adjustments may be needed.

• Antidiabetic agents: thiazides can impair glucose tolerance; monitor blood-sugar levels.

Food and Lifestyle Interactions

• Salt intake: high dietary sodium can counteract the diuretic’s effect; a low-salt diet is recommended.
• Alcohol: may increase orthostatic hypotension; limit excessive consumption.
• Driving/Machinery: dizziness can impair concentration; avoid operating heavy machinery until you know how the medication affects you.

If you are taking other prescriptions, over-the-counter drugs, herbal products, or dietary supplements, discuss them with your pharmacist or physician before starting Vaseretic.

How to Take Vaseretic

• Standard dosing: One tablet containing 10 mg enalapril / 25 mg hydrochlorothiazide once daily, usually in the morning to avoid nocturnal diuresis.
• Dose adjustments: May be considered in patients with renal impairment or in those who develop significant hypotension; any change must be directed by a healthcare professional.
• Administration: Swallow the tablet whole with a full glass of water. It may be taken with or without food.
• Missed dose: Take the missed dose as soon as you remember, unless it is close to the time of the next scheduled dose. Do not double the dose.
• Overdose: Symptoms may include severe hypotension, dizziness, electrolyte abnormalities, or renal failure. Seek emergency medical care; supportive measures and monitoring are the main treatments.
• Discontinuation: Do not stop abruptly without medical advice, especially if you have been on the medication for a long period. Gradual tapering may be recommended to avoid rebound hypertension.

Monitoring and Follow-Up

• Blood pressure: Check at each clinic visit; target values follow local guidelines (often < 130/80 mmHg for most adults).
• Renal function: Serum creatinine and eGFR should be measured within 1-2 weeks after initiation, then periodically (e.g., every 3-6 months).
• Electrolytes: Sodium and potassium levels are checked at baseline and during follow-up, especially if you have kidney disease or are on other potassium-affecting drugs.
• Blood glucose (if diabetic): Monitor fasting glucose or HbA1c periodically, as thiazides can increase glucose levels.

If any lab value deviates markedly from the normal range, your prescriber may adjust the dose or switch to an alternative regimen.

Storage and Handling

• Store Vaseretic tablets at room temperature, away from moisture, heat, and direct sunlight.
• Keep the container tightly closed and out of reach of children.
• Do not use the medication after the expiration date printed on the package.
• Dispose of unused tablets according to local pharmacy-take-back programs or follow the disposal instructions on the label.

Medication-Specific Glossary

ACE inhibitor

A class of drugs that block the conversion of angiotensin I to angiotensin II, leading to vasodilation and reduced blood pressure.

Thiazide diuretic

A type of diuretic that increases urine output by inhibiting sodium reabsorption in the distal tubules of the kidney, helping to lower blood volume and pressure.

Hyperkalemia

An elevated level of potassium in the blood, which can cause cardiac rhythm disturbances if severe.

Orthostatic hypotension

A drop in blood pressure upon standing, often manifesting as dizziness or light-headedness.

Angio-edema

Rapid swelling of subcutaneous tissues, especially around the face and airway, that can be life-threatening.

Medical Disclaimer

This article provides educational information about Vaseretic and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.