Sinoretik

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Sinoretik

Property Description
Active Ingredients Lisinopril, Hydrochlorothiazide (HCTZ)
Form Oral Tablet
Pharmacological Class ACE Inhibitor with Thiazide Diuretic
General Purpose Management of High Blood Pressure (Hypertension)
Origin Synthetic

What Type of Medication is Sinoretik?

Sinoretik is a prescription-only, fixed-dose combination medication used primarily for managing high blood pressure (hypertension). Pharmacologically, it is classified as a single oral tablet that belongs to the drug class known as ACE Inhibitors with Thiazides. The product is synthetic in origin and combines two distinct classes of agents to achieve a comprehensive reduction in systemic blood pressure. This dual therapy is clinically recognized for achieving stronger blood pressure control than either agent used alone. In the United States, this formulation is also marketed under the brand names Zestoretic and Prinzide, indicating its established use in the antihypertensive category.

Composition: Lisinopril and Hydrochlorothiazide (HCTZ)

The medicine is defined by its two primary active ingredients: Lisinopril and Hydrochlorothiazide (HCTZ). Lisinopril is an Angiotensin-Converting Enzyme (ACE) Inhibitor, a synthetic peptide derivative that helps to widen blood vessels. A distinguishing feature is that Lisinopril is a non-prodrug, meaning it is active immediately upon ingestion without requiring liver metabolism, unlike some other ACE inhibitors. Hydrochlorothiazide is classified as a Thiazide Diuretic, assisting the kidneys in eliminating excess salt and fluid to reduce overall volume.

General Purpose: Managing High Blood Pressure (Hypertension)

The general purpose of Sinoretik is to provide an effective, comprehensive strategy for lowering and stabilizing chronically elevated blood pressure in adults, particularly when monotherapy is insufficient. The two components work together to reduce resistance in the circulatory system, often being used as a cornerstone therapy for patients diagnosed with Stage 2 Hypertension. By maintaining a healthier, lower pressure, this combination medication is associated with the reduction of the overall cardiac workload on the heart and blood vessels.

Regulatory References

  1. Lisinopril and Hydrochlorothiazide Drug Information

What side effects are possible with Sinoretik?

Sinoretik is a combination drug containing the ACE inhibitor lisinopril and the thiazide diuretic hydrochlorothiazide. Its safety profile reflects the known risks associated with both components.

Clinically Significant Adverse Reactions

The most serious risk is angioedema, which involves swelling of the face, tongue, glottis, and/or larynx, a potentially life-threatening reaction associated with ACE inhibitors. Patients, particularly those of African-American descent, may have an increased risk. The drug is contraindicated in patients with a history of angioedema related to previous ACE inhibitor use, hereditary or idiopathic angioedema, or a history of hypersensitivity to sulfonamide-derived drugs (due to the hydrochlorothiazide component).

Common adverse reactions typically include dizziness, persistent dry cough (a class effect of ACE inhibitors), headache, and fatigue. Other reactions may involve the gastrointestinal system, skin, and metabolism.

Safety and Monitoring Considerations

The drug can cause symptomatic hypotension (excessive low blood pressure), especially upon standing or in patients who are volume- or salt-depleted. Safety monitoring should anticipate this risk. The diuretic component can cause disturbances in electrolytes, such as low potassium (hypokalemia) and low sodium (hyponatremia), which require regular laboratory monitoring.

Caution is warranted in patients with pre-existing renal impairment, as the elimination of lisinopril is decreased when the glomerular filtration rate is significantly low. The use of this combination product is also contraindicated in patients with anuria (inability to pass urine).

Overdose and Emergency Response

Overdose and when to seek help

The officially documented profile for a Sinoretik overdose is primarily characterized by the risk of profound hypotension (extremely low blood pressure) and severe volume depletion resulting from the dual action of the components. This physiological crisis may lead to manifestations such as dizziness, lightheadedness, fainting, and signs of electrolyte imbalance, including thirst, muscle cramps, and weakness. Gastrointestinal disturbances, such as upset stomach and vomiting, are also listed in regulatory documentation.

Overdosage carries the potential for severe outcomes, which include Acute Renal Failure (often linked to the severe drop in blood pressure) and central nervous system effects such as seizures or confusion.

Regulatory authorities mandate that the medication must be immediately discontinued upon suspicion of overdose, and immediate medical attention must be sought. Emergency services should be contacted if the patient collapses, has a seizure, has trouble breathing, or cannot be awakened.

Treatment is classified as symptomatic and supportive; there is no specific information available for treatment. Management procedures involve close observation, placing the patient in the supine position, and restoring volume using intravenous normal saline. The Lisinopril component may be removed by hemodialysis.

Therapeutic Uses of Sinoretik

What Sinoretik Treats: Main Uses and Benefits

Lisinopril/hydrochlorothiazide (Sinoretik) is commonly used for the long-term management of high blood pressure, known as Essential Hypertension. This medication is applied in addressing situations where symptoms of elevated systemic pressure remain uncontrolled by initial monotherapy. The medication is applied in clinical settings that involve chronic or unstable symptom patterns.

The therapeutic benefit is considered relevant for mitigating the risk associated with persistently high pressure. The combination supports the patient during periods of heightened systemic burden, relevant for easing the impact of conditions associated with increased physiological stress. Indications include the management of Essential Hypertension, and may be applied in addressing symptoms linked to organ-specific functional stress.

“By consistently stabilizing pressure, this dual approach helps patients cope more steadily with the complexities of chronic disease management.”

This dual approach is relevant for managing pressure in situations where symptoms create noticeable physiological strain, assisting with maintaining functional stability during chronic management.


Quick Fact: Relief for Chronic High Pressure This combination drug is commonly used to manage complex high blood pressure, contributing to easing the overall symptom load on the cardiovascular system.

Regulatory References

  1. NIH DailyMed authoritative labeling

Eligibility and Restrictions for Use

Eligibility and Contraindications for Sinoretik

Sinoretik (Lisinopril/Hydrochlorothiazide) is indicated for use in adults with essential hypertension. Official regulatory documentation defines several conditions and populations for whom the medicine is contraindicated or not recommended.


Classification Population or Condition
Absolute Contraindication History of angioedema related to previous ACE inhibitor use
Absolute Contraindication Hypersensitivity to Lisinopril, Hydrochlorothiazide, or other sulfonamide-derived drugs
Absolute Contraindication Anuria (inability to pass urine) or severe hepatic impairment
Absolute Contraindication Use during the second and third trimesters of pregnancy
Prohibited Concomitant Use Concurrent use with Aliskiren in diabetic patients or those with moderate-to-severe renal impairment
Prohibited Concomitant Use Use within 36 hours of taking a medicine containing Sacubitril (e.g., Entresto)

Age and Physiological Limitations:

  • Pediatric Use: Safety and efficacy have not been established for the combination tablet in the pediatric population.
  • Pregnancy and Lactation: Use is contraindicated in the 2nd and 3rd trimesters, not recommended in the 1st trimester, and not recommended during breastfeeding.

Organ and Condition Restrictions:

  • The medicine is contraindicated in patients with severe renal impairment (creatinine clearance <30 mL/min).
  • Use requires caution in patients with renal insufficiency, progressive liver disease, Systemic Lupus Erythematosus (SLE), and certain cardiovascular conditions like aortic stenosis. The combination should only be used in patients with renal insufficiency ( CrCl le 80 mL/min) after the individual components have been appropriately titrated.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documents describe several key interaction patterns for Sinoretik (Lisinopril/Hydrochlorothiazide), focusing primarily on pharmacodynamic reinforcement and strict contraindications to prevent adverse outcomes.


Contraindications and Mandatory Timing Rules

Co-administration with Sacubitril/Valsartan is contraindicated due to the officially documented risk of angioedema. A mandatory 36-hour separation window is required between discontinuing Sacubitril/Valsartan and initiating Sinoretik. Additionally, combining Sinoretik's Lisinopril component with Aliskiren is contraindicated in patients with diabetes mellitus or those with moderate to severe renal impairment (GFR < 60 mL/min/1.73m²).

Pharmacodynamic and Exposure Interactions

Co-administration with Potassium-sparing diuretics (e.g., Spironolactone) or Potassium Supplements increases the risk of hyperkalemia (elevated serum potassium levels). Concomitant use with Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) may reduce the drug's antihypertensive effect and increase the risk of worsening renal function. The regulatory label also states that Sinoretik reduces the renal clearance of Lithium, leading to a documented risk of lithium toxicity.

Dietary and Population Notes

The official bioavailability data indicates that taking Sinoretik with food has little or no effect on the exposure of the active ingredients. Regulatory information notes that elderly patients may exhibit significantly higher plasma exposure of both Lisinopril and Hydrochlorothiazide compared to younger patients.

Mechanism of Action

Sinoretik is a combination medicine containing Lisinopril (an ACE inhibitor) and Hydrochlorothiazide (a thiazide diuretic). It works through two distinct, but complementary, mechanistic domains to exert their effects via modulation of distinct signaling cascades and ion transport mechanisms.


Inhibition of Angiotensin-Converting Enzyme (ACE)

This domain involves Lisinopril, which acts by inhibiting the Angiotensin-Converting Enzyme (ACE). ACE is an enzyme-mediated signaling target that normally converts angiotensin I to the vasoconstrictor, angiotensin II. By suppressing the formation of angiotensin II and reducing the resulting stimulation of aldosterone secretion, this mechanism engages a cascade that leads to vasodilation (widening of blood vessels) and a decrease in fluid-retaining hormone activity, resulting in reduced systemic vascular resistance.


Inhibition of Renal Sodium-Chloride Symporter

The second domain involves Hydrochlorothiazide, which modulates key transport pathways in the distal convoluted tubule of the kidney. This mechanism specifically supports the regulation of processes driven by distinct signaling patterns by inhibiting the reabsorption of sodium and chloride ions. The resulting physiological consequence is an increase in the excretion of water and sodium chloride, leading to decreased plasma volume.

Dosage and Administration Information

How to Use Sinoretik: Official Administration Guidelines

Sinoretik, a fixed-dose combination of lisinopril and hydrochlorothiazide (HCTZ), is administered via the oral route as a tablet and is intended for once-daily dosing. Consistent daily administration, preferably at the same time each day (such as in the morning), is the established usage pattern. The fixed-dose combinations are available in strengths such as 10 mg lisinopril / 12.5 mg HCTZ, 20 mg lisinopril / 12.5 mg HCTZ, and 20 mg lisinopril / 25 mg HCTZ.

Usage Structure and Regimens

The fixed-dose combination is generally not intended for initial therapy of high blood pressure. Its use is reserved for patients whose pressure is not adequately controlled by lisinopril or HCTZ alone, or for those who have been stabilized on the individual components given separately. The usual starting combination for fixed-dose use is 10 mg/12.5 mg or 20 mg/12.5 mg taken once per day. Dose adjustments may be made based on blood pressure response, typically after two to four weeks of treatment. The maximum daily dosage is generally not to exceed 80 mg lisinopril and 50 mg HCTZ (based on monotherapy component limits).

Specific Administration Conditions

Condition Official Instruction
Timing Relative to Food May be taken with or without food.
Tablet Handling The tablet should be swallowed whole.
Prior Diuretic Therapy Prior diuretic use should be discontinued for 2 to 3 days before starting the combination.

Population-Specific Rules: The combination is contraindicated in patients with severe renal impairment (creatinine clearance < 30 mL/ min). No specific dose adjustment is typically required for older adults (65 years and over), though the components' clearance may be reduced. The treatment is designed for long-term management of essential hypertension.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Sinoretik

This overview summarizes the structure of the clinical research for the fixed-dose combination of lisinopril and hydrochlorothiazide (Sinoretik), focusing strictly on the types of studies conducted and the patterns observed in research, rather than offering medical advice or treatment instructions.


Evidence for Use in Managing Essential Hypertension

The primary evidence base for this medication includes Randomized Controlled Trials (RCTs). These short-term studies were used in research exploring how blood pressure measurements change over defined time intervals. The research primarily examined adults diagnosed with high blood pressure, known as Essential Hypertension.

In these trials, researchers monitored changes in two key metrics: Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP). Studies explored the patterns observed when the combination was compared directly against a non-active control (placebo), as well as against either component drug—lisinopril alone or hydrochlorothiazide alone. Studies described patterns where the dual-component therapy was observed to yield greater measured outcomes compared to the outcomes measured for either component used alone.

Long-Term Research and Sustained Effects

While many trials focused on establishing initial efficacy over short periods, longer-term studies were included in some research. Follow-up durations were limited, with the initial key trials typically extending only a few months. However, research describes how blood pressure control evolved in the observed populations over these defined time intervals, with some extension studies tracking maintenance for up to one year.

Research examining major long-term outcomes, such as stroke or heart attack, is not fully established by dedicated, multi-year RCTs specifically for this fixed-dose combination. Conclusions regarding these long-term outcomes often rely on extrapolation from the known, generalized effects of the blood pressure reduction achieved across multiple classes of antihypertensive drugs.

What is Still Uncertain in the Research Record

Data for certain groups are limited or insufficient. Specifically, appropriate studies have not been performed to establish the safety and efficacy patterns in the pediatric population. Additionally, research has also examined potential differences observed across racial and ethnic subgroups. Data show patterns related to blood pressure changes in these groups, though some studies have reported that findings were mixed across these subgroups, particularly concerning the maximum strength of the combination.


Research provides context but not individual predictions. Studies help show what has been observed so far.

Frequently Asked Questions (FAQ)

Common questions about Sinoretik (FAQ)


Q: Is a persistent dry cough a known side effect of Sinoretik?

Yes, regulatory documents describe a persistent dry cough as a common side effect associated with the lisinopril component, which belongs to the ACE inhibitor class. This cough is generally non-productive (dry). Official product information indicates that the cough is generally reported to resolve after the medication is discontinued.


Q: Why does Sinoretik increase the frequency of urination?

The increased frequency of urination is due to the hydrochlorothiazide component, which is a diuretic. The drug's official mechanism involves the kidneys, where it acts to inhibit the reabsorption of sodium and chloride. This leads to an increased excretion of water and salt, resulting in the need to urinate more often.


Q: Can Sinoretik affect potassium levels if a person uses potassium supplements?

Official information cautions that taking potassium supplements or certain other diuretics alongside Sinoretik significantly increases the risk of developing hyperkalemia, which is an elevated level of potassium in the blood. Official product information advises caution regarding this combination.


Q: Is it safe to use salt substitutes while taking a drug like Sinoretik?

Salt substitutes are typically cautioned against in official information unless specifically instructed otherwise by a healthcare provider. This is because many salt substitutes use potassium chloride instead of sodium chloride, which carries the same risk of hyperkalemia (high potassium levels) as taking a potassium supplement.


Q: What information is available about using Sinoretik while breastfeeding?

Regulatory information indicates that the medication is not recommended for use while breastfeeding. This is because both active components, lisinopril and hydrochlorothiazide, are known to be present in human milk.


Q: Do lifestyle changes, like diet and exercise, still matter when taking Sinoretik?

Yes, official patient information often indicates that the management of high blood pressure involves a comprehensive approach. Treatment may include weight control and specific dietary changes (such as sodium restriction), which should be considered alongside the medication for overall blood pressure management.


Q: What is the guidance regarding driving or operating machinery while using Sinoretik?

Official safety information advises caution, particularly when starting treatment. Patients are generally informed that they may need to avoid driving or operating hazardous machinery due to the potential for side effects like dizziness, lightheadedness, or fainting (hypotension), until they are certain of how the medication affects them.


Q: What are the signs of a potassium level change that may be associated with Sinoretik?

Symptoms that may indicate a potassium change include muscle weakness, muscle pains or cramps, and a slow or irregular heartbeat. These signs are noted in official adverse reaction reports.


Q: What is the potential interaction between Sinoretik and alcohol consumption?

Official drug information notes that alcohol consumption can have additive effects with the blood pressure-lowering action of Sinoretik. Official drug information suggests this combination may potentially increase side effects related to low blood pressure, such as dizziness and lightheadedness.


Q: What are the general research findings concerning Sinoretik's effectiveness in racial and ethnic subgroups?

Clinical studies have examined differences in outcomes across subgroups. Official documentation reports that the effectiveness of ACE inhibitors, including lisinopril, for lowering blood pressure may be less in Black patients compared to non-Black patients. Additionally, the risk of angioedema is also reported to be higher in Black patients.


Q: What precautions related to sun exposure are associated with the diuretic component of Sinoretik?

The hydrochlorothiazide component is known to increase the skin's sensitivity to sunlight, a condition called photosensitivity. Official patient information suggests the use of protective measures and limiting exposure to sunlight and UV rays.


Q: Is a fast or irregular heartbeat a possible side effect of Sinoretik?

Yes, official adverse reaction reports list symptoms such as a rapid, pounding, slow, or irregular heartbeat (arrhythmia) as a possible side effect. This may be reported alongside electrolyte disturbances that can occur with the diuretic component.


Q: Is it common to feel tired when first starting Sinoretik?

Excessive tiredness or fatigue is listed among the common adverse reactions reported in clinical experience with Sinoretik. Official information indicates that this side effect may be observed when treatment is first initiated.


Q: What is the connection between Sinoretik and the body's sodium levels?

The diuretic component of Sinoretik works to increase the removal of salt and water, and this action can cause a reduction in serum sodium levels, known as hyponatremia. Official safety information emphasizes that sodium levels require regular monitoring.


Q: Is it common for Sinoretik to cause stomach issues like nausea or diarrhea?

Yes, official reports of adverse reactions list both nausea and diarrhea among the common gastrointestinal side effects observed in clinical experience with the lisinopril component of the medication.


Q: Why does the diuretic component of Sinoretik sometimes cause leg cramps?

Muscle cramps and muscle weakness are reported side effects that may occur with this drug. These symptoms are often noted in connection with disturbances in electrolytes (such as low potassium or magnesium) caused by the diuretic component.


Q: Are there specific over-the-counter cold or flu medicines that interact with Sinoretik?

Official warnings state that certain cold and flu medicines containing sympathomimetic agents (like decongestants) may be used cautiously. This is because these agents can counteract the blood pressure-lowering effect of Sinoretik and may also cause adverse cardiovascular effects.


Q: What does the official documentation say about Sinoretik and the risk of skin cancer (non-melanoma)?

Regulatory documents state that the hydrochlorothiazide component is associated with a cumulative, dose-dependent increased risk of non-melanoma skin cancer. This risk specifically involves Basal Cell Carcinoma and Squamous Cell Carcinoma with prolonged, high-dose use of the diuretic.

How should Sinoretik be stored and disposed of?

How to Store and Dispose of Sinoretik

Sinoretik (lisinopril and hydrochlorothiazide) tablets must be stored according to specific regulatory requirements to maintain product stability and effectiveness.

Storage Conditions

Requirement Specification
Temperature Store at room temperature, typically between 15 C and 30 C (59 F and 86 F).
Protection Keep the medication protected from light and moisture. Do not store in the bathroom.
Container Keep the medicine in the container it came in and ensure the container is tightly closed.
Prohibited Keep from freezing and away from excess heat.

Handling and Disposal

The medicine must always be kept out of the reach of children for safety. Do not keep outdated or unneeded medicine. Disposal of unused or expired Sinoretik must be performed according to local regulations. You must not flush the medication down a toilet or pour it into a drain.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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