Selectan

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Medically reviewed

Rosario Oropesa

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 Selectan

What is Selectan?

Selectan is a veterinary antimicrobial medication primarily used in the treatment of bacterial infections in livestock. It belongs to the phenicol class of antibiotics, which are characterized by their ability to inhibit bacterial protein synthesis. This mechanism prevents the growth and multiplication of susceptible bacteria, allowing the animal's immune system to overcome the infection.

Therapeutic Classification

As a broad-spectrum antibiotic, Selectan is effective against a variety of Gram-positive and Gram-negative organisms. It is specifically formulated for use in food-producing animals, such as cattle and swine, where it is utilized to manage systemic and localized bacterial diseases.

Primary Indications

The medication is most frequently employed to address the following conditions in a clinical veterinary setting:

  • Respiratory Infections: Treatment of bovine respiratory disease (BRD) associated with organisms such as Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni.
  • Interdigital Phlegmon: Management of foot rot and acute interdigital necrobacillosis caused by Fusobacterium necrophorum and Bacteroides melaninogenicus.
  • Porcine Respiratory Disease: Control of respiratory infections in swine caused by Actinobacillus pleuropneumoniae and Pasteurella multocida.

Mechanism of Action

The active ingredient in Selectan works by binding to the 50S ribosomal subunit of the bacteria. By interfering with the enzyme peptidyl transferase, the drug blocks the attachment of amino acids to the growing peptide chain. This action is generally bacteriostatic, meaning it halts bacterial reproduction rather than killing the bacteria directly, although it may exhibit bactericidal activity against certain highly sensitive strains.

What side effects are possible with Selectan?

Possible Side Effects and Safety Information

The safety profile of Selectan (Valsartan) is officially documented by government regulatory agencies, which classify potential adverse reactions based on clinical trial frequency and post-marketing surveillance.

Frequency-Classified Adverse Reactions

Adverse reactions are grouped by the likelihood of their occurrence, using regulatory frequency bands:

  • Common: Dizziness, headache, fatigue, and hypotension are frequently observed in clinical use. Common effects also include back pain and hyperkalemia (increased blood potassium), particularly in studies involving heart failure patients.
  • Uncommon: Reactions occurring less frequently include vertigo, cough, and abdominal pain.
  • Very Rare: Very rarely reported effects in post-marketing experience include hepatitis and thrombocytopenia (low platelet count).

System-Organ-Class Safety

Side effects are classified by the physiological system affected, including the Nervous System (e.g., dizziness, headache), Vascular (e.g., hypotension), Renal and Urinary (e.g., impaired renal function), and Gastrointestinal (e.g., diarrhea).

Serious Safety Considerations

The official labeling contains specific warnings for serious adverse reactions. The most significant is the Fetal Toxicity Boxed Warning, indicating that use during the second and third trimesters of pregnancy can cause injury or death to the developing fetus. Other serious reactions reported include angioedema, which involves swelling of the face, tongue, or throat, and the potential for acute renal failure in susceptible patients.

Population-Specific Restrictions

Safety constraints apply to specific patient groups. Selectan is officially contraindicated in patients with severe hepatic impairment (including biliary cirrhosis or cholestasis) and is not recommended for individuals with Primary Hyperaldosteronism or those who have recently received a kidney transplant. Symptomatic hypotension is noted as a risk that may occur after treatment initiation in volume-depleted individuals.

Overdose and Emergency Response

Overdose and when to seek help

Overdose Scope

Element Official Regulatory Description (Valsartan)
Documented overdose presentations The principal clinical manifestation of Selectan overdose is excessive hypotension (severely low blood pressure). Other documented signs may include dizziness, tachycardia (rapid heart rate), bradycardia (slow heart rate), and decreased consciousness in severe cases.
Physiological systems affected (as stated in label) The primary system affected is the cardiovascular system, leading to hemodynamic instability. Severe outcomes can involve the renal system, specifically the potential for acute renal failure.
Population-specific overdose notes (if applicable) Patients noted to be highly susceptible to symptomatic hypotension are those who are volume- and/or salt-depleted at the time of exposure.
Emergency-response statements (as written in official documents) Overdose management is symptomatic and supportive. If excessive hypotension occurs, the patient should be placed in the supine position and given an intravenous infusion of normal saline, if deemed necessary by a healthcare professional.

Official Overdose Statements and Required Actions

  • Seek immediate medical attention for any suspected overdose. This action is mandated by the regulatory labeling, which instructs contacting emergency services or a Poison Control Center or proceeding directly to the nearest hospital emergency room.
  • The substance is not removed by hemodialysis due to its high plasma protein binding, which limits treatment options to supportive care.
  • Severe outcomes that define the classification include shock and acute renal failure arising from sustained low blood pressure.

Connection to the overall overdose profile: Regulatory documents define the Selectan overdose profile primarily by the severe physiological consequence of excessive hypotension and the resulting risk of life-threatening events such as shock. The official information mandates that urgent medical attention must be sought immediately for suspected exposure, and outlines that treatment is procedural and supportive, given the absence of a specific antidote.

Therapeutic Uses of Selectan

What Selectan Treats: Main Uses and Benefits

Selectan (Valsartan) is commonly used to help with managing conditions characterized by periods of heightened symptoms. Its primary therapeutic use focuses on managing conditions associated with Hypertension in adults and children, where it addresses the continuous burden of elevated systemic pressure and symptoms that create noticeable physiological strain.

The medication is also relevant for adults dealing with conditions associated with acute or disruptive episodes, such as Chronic Heart Failure and following a heart attack. In addition, Selectan provides specialized therapeutic support for vulnerable organs, particularly the kidneys, in patients with Type 2 Diabetes and high blood pressure, addressing progressive damage like Diabetic Nephropathy. The general benefit supports the patient during difficult episodes by easing distress and assists with maintaining functional stability.

“The medication is applied across domains where additional symptomatic support is needed, helping manage symptoms that interfere with daily comfort.”

Quick Fact: Relief for Fluid Overload

Regulatory References

  1. DailyMed: VALSARTAN tablet

Eligibility and Restrictions for Use

Official Population Eligibility Rules for Selectan

Eligibility to use Selectan (Valsartan) is strictly defined by official regulatory bodies based on age, physiological state, and existing medical conditions.


Populations Prohibited from Use (Contraindicated)

The medicine is contraindicated in pregnancy and must be discontinued immediately upon detection due to the high risk of fetal toxicity. Use is also prohibited in patients with known hypersensitivity to valsartan or any component of the formulation. A further absolute prohibition applies to individuals with severe hepatic impairment, biliary cirrhosis, or cholestasis. The label also forbids concurrent use with the drug aliskiren in patients diagnosed with diabetes mellitus.


Age and Condition Restrictions

Selectan is approved for adults for all labeled indications. In the pediatric population, use is officially restricted to treating hypertension in children typically six years of age and older. It is not recommended for children below this age threshold or for the treatment of heart failure or post-myocardial infarction in adolescents. Patients with mild to moderate hepatic impairment (without cholestasis) may use the drug under a strict maximum dose restriction. Use is also officially not recommended during lactation or in patients with primary hyperaldosteronism.

What should I know about interactions with other medicines?

The official regulatory profile for Selectan (Valsartan) details interactions that carry a risk of adverse outcomes, primarily due to combined pharmacodynamic effects.

Documented Pharmacodynamic and Exposure Interactions

Interaction Type Interacting Agent Official Regulatory Outcome
Contraindication (Conditional) Aliskiren Prohibited for co-administration in patients with Diabetes Mellitus or Renal Impairment (GFR < 60 mL/min/1.73 m^2) due to increased risk of hyperkalemia, hypotension, and renal function changes.
Exposure Modification Lithium Co-administration results in increased serum Lithium concentrations and the risk of Lithium toxicity, owing to a documented reduction in the drug's renal clearance.
Additive Effect ACE Inhibitors or Aliskiren (Dual RAS Blockade) Increased risk of Hypotension, Hyperkalemia, and Renal Impairment due to additive actions on the Renin-Angiotensin System (RAS).
Additive Effect Potassium-Sparing Diuretics (e.g., Spironolactone) or Potassium Supplements Increased risk of Hyperkalemia (elevated serum potassium levels). This risk is specifically highlighted in labeling for patients with Chronic Heart Failure.
Reduced Efficacy/Risk Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) May lead to a reduction of the antihypertensive effect of Valsartan and a heightened risk of worsening renal function.

No mandatory administration timing or separation rules are formally documented for other medicinal products. No clinically significant interactions via CYP enzymes are stated in the major regulatory labeling.

Mechanism of Action

Targeting Bacterial Protein Synthesis

Selectan exerts its action by specifically targeting and binding reversibly to the 50S ribosomal subunit within susceptible bacteria. This molecular binding directly inhibits the enzyme peptidyl transferase, a critical component of the bacteria's machinery for manufacturing new proteins. This engagement constitutes the mechanism by which the drug interferes with the fundamental cellular processes of microbial growth and multiplication.


Resulting Physiological Effect: Halting Bacterial Growth

By preventing peptidyl transferase from creating the peptide bonds required to build proteins, the drug halts the construction of essential structural and functional components necessary for the bacteria to survive and divide. This interruption of the bacterial lifecycle limits the proliferation of the microorganisms, which reduces the overall bacterial load in the body, and contributes to the drug's observed physiological consequence.

Dosage and Administration Information

Selectan is administered exclusively by the oral route, available as film-coated tablets in strengths ranging from 40 mg to 320 mg, and as an oral suspension prepared for specific patient needs. The tablets may be taken with or without food, ensuring consistency in daily use.

The dosing regimen pattern varies by clinical scenario. For Hypertension, the standard starting dose is typically 80 mg or 160 mg, taken once daily, with the dose adjusted up to a maximum of 320 mg daily. For conditions such as Heart Failure or following a Myocardial Infarction, the dose is generally administered twice daily in divided amounts. For Heart Failure, treatment begins at 40 mg twice daily and is gradually increased, or titrated, at intervals of at least two weeks.

Dosing requires specific consideration for some populations. Pediatric patients (ages 6–16) with hypertension use a weight-based dosing regimen, which may not exceed 160 mg total daily. Furthermore, for patients with mild-to-moderate liver impairment (without cholestasis), the total daily dose should not exceed 80 mg. It is important to note that the liquid suspension form and the tablet form are not substitutable on a milligram-for-milligram basis due to differences in systemic exposure.

Recent Clinical Evidence

Research evidence / Overview of studies for Selectan

Evidence for use in Hypertension (High Blood Pressure)

Research for Selectan's use in high blood pressure was primarily conducted using large-scale, international Randomized Controlled Trials (RCTs). These studies included adults with essential hypertension and those with high cardiovascular risk. The outcomes monitored included the measurement of changes in Systolic and Diastolic Blood Pressure (BP), alongside tracking the occurrence of major cardiovascular events such as stroke. The studies report patterns related to blood pressure levels measured across various time points and settings. Research also examined data related to the development of new-onset Type 2 Diabetes in observed populations.

Evidence for use in Chronic Heart Failure

Selectan was evaluated in large-scale RCTs and subsequent systematic reviews focusing on adults with Chronic Heart Failure (CHF) where heart function is reduced, or in individuals who developed functional limitations following a recent heart attack. Research tracked all-cause mortality, the frequency of heart failure hospitalization, and changes in physiological measures. Findings describe patterns observed in these studies related to mortality and hospitalization rates. Evidence concerning clinical outcomes for Selectan monotherapy in patients with Heart Failure with Preserved Ejection Fraction (HFpEF) was associated with mixed findings in some studies.

Evidence for use in Diabetic Nephropathy (Kidney Disease in Type 2 Diabetes)

Studies explored Selectan's role in kidney damage occurring in adults with Type 2 Diabetes. These trials included populations who showed early signs of kidney damage. Research monitored physiological strain by examining changes in the amount of protein in the urine, the stability of kidney filtering rate (eGFR), and the time taken to progress to End-Stage Renal Disease (ESRD). The studies report patterns related to protein levels in the urine measured across cohorts observed during the study period.


Research Gaps and What Remains Uncertain

The evidence highlights what is known—and what is still uncertain—about Selectan. Key limitations include that long-term effects are not fully established across all indications, and in some heart failure populations, the data for clinical outcomes may be mixed or heterogeneous. Comparative evidence is lacking for certain specific outcomes against all available competing treatments. Furthermore, the findings describe group patterns, and research does not determine whether an individual will respond similarly, as study results reflect the specific conditions under which they were conducted.

Frequently Asked Questions (FAQ)

Common questions about Selectan (FAQ)


Q: Is Selectan a type of antibiotic?

Regulatory documents identify Selectan (Valsartan) as an Angiotensin II Receptor Blocker (ARB), not an antibiotic. Its primary function involves blocking the action of angiotensin II, which is the mechanism used to manage blood pressure.


Q: Is Selectan only for serious health issues?

The medication is officially indicated for a range of conditions, which includes both common issues like high blood pressure (hypertension) and more severe health problems. It is also used in managing patients with heart failure and after a heart attack.


Q: Can Selectan be taken by people with kidney issues?

Official product information notes that the use of Selectan in people with kidney issues requires careful consideration. For many people with mild to moderate kidney impairment, a dose adjustment is generally not required. However, for those with more severe impairment, official labels advise caution.


Q: Can Selectan cause any long-term health problems?

Large, long-term clinical trials have focused on the safety and effects of Selectan over many years. These studies reported a generally favorable safety profile, and observed patterns related to specific long-term benefits in some populations, such as a reduced rate of developing new-onset diabetes.


Q: Is Selectan generally safe for long-term use?

The safety and efficacy of Selectan have been thoroughly reviewed in major, long-term randomized clinical trials. These studies, which included patient follow-up periods averaging over four years, support the profile for long-term use.


Q: What types of food or drinks should be avoided while taking Selectan?

According to official pharmacokinetic data, taking Selectan with food can reduce the amount of the medication absorbed into the bloodstream by up to 50%. Furthermore, the regulatory label warns that co-administration with Potassium-Sparing Diuretics or Potassium Supplements increases the risk of elevated serum potassium levels (hyperkalemia).


Q: Is it safe to drive a car while taking Selectan?

Official product information notes that the medication may have a minor influence on the ability to drive or use machinery. Since common side effects, such as dizziness or fatigue, are reported, patients should be aware of these potential effects.


Q: Do studies suggest Selectan works better for certain groups of people?

Studies on Selectan focus on the drug's effects across large groups of patients. Trials have noted patterns where certain outcomes, such as a reduced rate of new-onset diabetes, were more frequently observed in specific high-risk hypertensive populations.


Q: Does Selectan require special monitoring, like blood tests?

Regulatory agencies advise the regular monitoring of certain blood parameters while on Selectan therapy. Monitoring typically includes checks of serum creatinine (for kidney function) and serum potassium levels, particularly at the initiation of treatment and following dose adjustments.


Q: Is Selectan considered a high-risk medication?

The official label contains a Boxed Warning that Selectan should not be used during the second and third trimesters of pregnancy due to the risk of fetal toxicity. Despite this serious warning for a specific population, the drug is listed on the World Health Organization's (WHO) Model List of Essential Medicines for managing cardiovascular diseases.


Q: Does taking Selectan prevent [Condition] from getting worse?

Studies and official information indicate that Selectan is used to reduce the risk of serious outcomes in stable patients, such as reducing the risk of cardiovascular death. It is also studied for its effect in slowing the progression of kidney damage in patients with Type 2 diabetes.


Q: How quickly does Selectan start working?

Following a single dose, the antihypertensive effect begins to occur in about two hours. The maximum reduction in blood pressure is usually observed within six hours of taking the medication.


Q: How long do the effects of Selectan usually last?

According to official pharmacokinetic data, the blood pressure-lowering effect of a single daily dose is designed to persist for 24 hours. This sustained effect is why the drug is typically taken once per day for hypertension.


Q: Are there common misunderstandings about what Selectan does?

Selectan is classified as an Angiotensin II Receptor Blocker (ARB). Its mechanism involves antagonizing the AT1 receptor, which is the action associated with its use in managing blood pressure and heart function.


Q: Is Selectan safe for people who are over 65?

Official product information notes that Selectan is approved for the adult population. While no specific dosage adjustment is required solely based on age, pharmacokinetic studies indicate that older patients may have a higher concentration of the drug in their system for longer periods.


Q: Are weight gain or weight loss listed as possible side effects of Selectan?

Official safety reports list both weight gain (weight increased) and weight loss (weight decreased) as possible adverse reactions. These effects are categorized as Uncommon side effects, which indicates they occurred in a low percentage of patients during clinical trials.


Q: Does Selectan affect my mood or behavior?

Official safety data includes depression and mood swings among the psychiatric adverse reactions that may occur. These are categorized as Uncommon side effects, indicating they were reported in a small percentage of patients during clinical trials.


Q: Is Selectan a controlled substance?

According to the U.S. Drug Enforcement Administration (DEA) and federal regulations, Selectan (Valsartan) is not classified as a controlled substance.


Q: Is there a generic version of Selectan available?

The active ingredient in Selectan is Valsartan, which is available as a widely used generic tablet formulation.


Q: Is there specific research about Selectan and alcohol use?

Official product information notes that drinking alcohol while taking Selectan can increase the risk of experiencing certain side effects. This includes intensifying effects like dizziness, fatigue, and headache.


Q: Are there any known issues with Selectan and sun exposure?

A photosensitivity reaction, which involves an increased sensitivity to sunlight, is listed in the official adverse reaction data. This is categorized as an Uncommon side effect, indicating it occurred in a low percentage of patients in clinical trials.

How should Selectan be stored and disposed of?

Official Storage and Disposal Requirements

Regulatory information defines the strict conditions required to maintain the stability and safety of Selectan.

Storage Component Requirement (Based on Official Labels)
Temperature Store at or below 25 C (unless refrigeration is specified for certain forms); Do not freeze.
Protection Keep out of the sight and reach of children. Store in the closed original container and protect from light.
Stability (In-Use) The product has specific time limits for use after opening or dilution (e.g., 28 days for opened oral solution, 24 hours for diluted solution).
Disposal Unused medicine and waste must be disposed of according to local regulatory requirements.
Environmental Must not be allowed to enter surface water due to potential harm to aquatic organisms. Specialized management of treated waste (e.g., storing treated animal manure for 3 months) is required.

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

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