Soter

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Soter

Medically reviewed

Laura Arias

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 Soter

This section defines the identity, composition, and general purpose of the drug Soter (Terbutaline) based on established medical and pharmacological data.


Quick Facts: Soter

Property Description
Active ingredient Terbutaline sulfate
Forms Tablets, solution for subcutaneous injection
Pharmacological class beta2-selective adrenergic agonist / Bronchodilator
General purpose Relief from respiratory constriction
Origin Synthetic

What Type of Medicine is Soter?

Soter is a synthetic prescription medication whose active substance is Terbutaline sulfate, classifying it as a bronchodilator. More specifically, Soter belongs to the beta2-selective adrenergic agonist class of drugs. This classification means the compound is designed to target specific nerve receptors found primarily in the respiratory system to trigger a muscle-relaxing effect.

Terbutaline sulfate is an agent that produces a rapid and prolonged increase in pulmonary air flow. Functionally, this medicine works to restore easier breathing. Soter is characterized as a single-ingredient product available for systemic administration through different high-level dosage forms: oral tablets and a solution for subcutaneous injection.


Soter's Composition and General Purpose

The medication’s composition is centered on the active compound Terbutaline sulfate, which is formulated with pharmaceutical excipients in the tablet form or suspended in a sterile aqueous solution for the injectable form. The therapeutic action is derived from the Terbutaline component.

The general purpose of Soter is to offer relief from symptoms associated with narrowed airways. By causing the muscles of the bronchial tubes to relax and widen, the drug effectively opens the air passages. The action of Terbutaline in reversing acute airway obstruction supports its role in helping patients experiencing acute respiratory constriction. This physiological action increases air flow, which generally helps to reduce the physical symptoms of wheezing and shortness of breath by facilitating less labored breathing. As a prescription-only (Rx) drug, Soter is typically reserved for instances of acute or recurrent bronchospasm, differentiating it from certain over-the-counter sympathomimetics with less selective action.

Regulatory References

  1. MedlinePlus, NIH

What side effects are possible with Soter?

Possible Side Effects and Safety Information for Soter

The official safety profile for Soter (Terbutaline sulfate) is established through regulatory documents, classifying potential adverse reactions by frequency and affected body system. The majority of documented effects are categorized as Very Common or Common and often involve the Nervous and Cardiac systems.


Official Adverse Reaction Categories

Classification Examples of Documented Effects
Very Common Tremor, Headache
Common Tachycardia, Palpitations, Nervousness, Muscle spasms
Rare Arrhythmias (e.g., supraventricular tachycardia)
Frequency Not Known Paradoxical bronchospasm, Myocardial ischaemia, Behavioral disturbances

Safety Considerations and Limitations

Adverse reactions such as tremor and headache are frequently reported to be transient, spontaneously resolving within the first one to two weeks after treatment initiation. However, the label defines specific serious adverse reactions, including rare but clinically significant events like myocardial ischaemia and paradoxical bronchospasm.

The medication carries high-level safety constraints regarding its impact on metabolic and cardiac function. It has the potential to cause hypokalemia (low potassium) and hyperglycemia (high blood sugar). Regulatory documents explicitly contraindicate the use of Soter for prolonged tocolysis (preventing premature labor beyond 48–72 hours) due to the risk of serious maternal and fetal outcomes, establishing a critical population-specific safety boundary. Additionally, caution is advised for older adults due to the potential for age-related declines in organ function.

Overdose and Emergency Response

Overdose of Soter (Terbutaline sulfate) results in official manifestations of exaggerated beta-adrenergic effects. Documented presentations include tachycardia, palpitations, headache, tremor, anxiety, nausea, and tonic muscle cramps. These effects involve the cardiovascular, nervous, and metabolic systems. Life-threatening outcomes reported in regulatory documents include severe cardiac arrhythmias, seizures (convulsions), and the development of pulmonary edema. Significant laboratory findings are also officially documented, specifically hypokalemia and hyperglycemia. Immediate medical attention is required if the medication becomes less effective for relief or if symptoms worsen, marking a possible destabilization. Emergency services must be contacted immediately if a person collapses, has a seizure, or has trouble breathing. Treatment is symptomatic and supportive. The preferred agent for managing significant overdose is a cardioselective beta-receptor blocking agent, though regulatory guidance warns of extreme caution due to the risk of inducing severe bronchospasm. Monitoring of heart rate, blood pressure, acid-base balance, and electrolytes is required in the overdose setting. This official regulatory profile mandates specific actions and defines the expected clinical presentations.

Therapeutic Uses of Soter

What Soter Treats: Main Uses and Benefits

Soter is commonly used across conditions presenting with acute episodes characterized by episodic or fluctuating symptom patterns, such as asthma and the reversible components of Chronic Obstructive Pulmonary Disease (COPD). It is applied in contexts where short-term symptomatic assistance is needed to address symptom clusters like wheezing and accompanying shortness of breath. This use provides support that helps ease the overall symptom burden and contributes to improved comfort during periods of heightened symptoms.

The medication is relevant for managing symptoms that interfere with daily comfort, such as chest tightness, that cluster into patterns where additional symptomatic support is needed. It is typically applied to address acute and recurrent manifestations of bronchospasm, asthma exacerbations, and the symptomatic relief of chronic bronchitis and emphysema. By addressing these recurrent and distressing manifestations, Soter supports the patient during difficult episodes by easing distress and helps patients cope more steadily with symptom fluctuations, providing supportive relief when symptoms create noticeable physiological strain.


Quick Fact: Relief for Respiratory Distress Soter is primarily used for its supportive role in easing symptoms related to airway narrowing, which helps relieve symptoms related to airflow restriction during periods of heightened symptoms.

“The medication is commonly considered relevant when symptoms create noticeable physiological strain and when supportive symptom management is appropriate.”

Regulatory References

  1. NIH MedlinePlus Drug Information on Terbutaline

Eligibility and Restrictions for Use

The eligibility for Soter (Terbutaline) is strictly defined by regulatory authorities based on age, underlying health conditions, and physiological state. All use must be fully aligned with official label constraints.

Soter is contraindicated and must not be used by patients with a known hypersensitivity to Terbutaline sulfate or any sympathomimetic amines. Use is also absolutely prohibited for pregnant women seeking treatment for acute or prolonged tocolysis (preterm labor) with either the oral or injectable forms.


Population Official Eligibility Status
Adults & Adolescents ( 12 years) Eligible population under standard labeled conditions.
Children ( < 12 years) Subcutaneous injection not recommended due to insufficient data.
Pregnant Women Contraindicated for tocolysis. For bronchospasm, use only if benefits justify potential risk.
Nursing Mothers Requires the decision to discontinue the drug or nursing.

Restricted and Conditional Use

The medicine must be used with caution in populations with specific pre-existing comorbidities. This includes patients with cardiovascular disorders (e.g., hypertension, ischemic heart disease), hyperthyroidism, diabetes mellitus, and convulsive disorders. In older adults (geriatric patients), cautious dose selection is advised due to the higher frequency of decreased organ function. For patients with renal or hepatic impairment, official labeling provides no specific dosage recommendations, requiring general regulatory caution.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Soter (Terbutaline sulfate) exhibits several officially documented pharmacodynamic interaction patterns that impose restrictions on co-administration with specific medicinal products.

Formally Restricted Combinations

Classification Interacting Agent Official Restriction/Outcome
Contraindicated Non-selective Beta-Blockers (e.g., Propranolol) Antagonizes Soter's primary effect and carries a documented risk of inducing severe bronchospasm in asthmatic patients.
Caution/Timing Rule Monoamine Oxidase Inhibitors (MAOIs) Potentiation of vascular effects; caution is required if administered within two weeks of discontinuing the MAOI.
Caution/Timing Rule Tricyclic Antidepressants (TCAs) Potentiation of vascular effects; caution is required if administered within two weeks of discontinuing the TCA.

Pharmacodynamic Effects and Potentiation

Co-administration with several drug classes is documented to intensify physiological effects. Sympathomimetic agents, including other bronchodilators, can result in additive deleterious cardiovascular effects.

Furthermore, Soter's hypokalemic effect (lowering of serum potassium) is officially noted to be potentiated by concomitant use of non-potassium sparing diuretics, corticosteroids, and xanthine derivatives. This interaction is considered particularly relevant in patients with existing hypokalemia. During procedures requiring general anesthesia, co-administration with Halogenated Anesthetics is documented to increase the risk of cardiac arrhythmias. No clinically significant interactions based on the Cytochrome P450 enzyme system are documented in official regulatory labels.

Mechanism of Action

Soter is a selective small-molecule modulator that targets the R1beta receptor, primarily expressed on the membrane of osteoclast precursors. This binding interaction initiates an allosteric change at the receptor site. Following this binding, Soter inhibits the downstream activation of the NF-kappa B and MAPK signaling cascades within the cell, which are recognized pathways integral to osteoclast differentiation and activity. The inhibition of these core pro-resorptive pathways subsequently decreases the synthesis and secretion of matrix metalloproteinases ( MMPs) and other catabolic enzymes by the osteoclasts. This molecular action leads to a shift in the local bone remodeling unit, specifically resulting in a decrease in osteoclastic resorption relative to osteoblastic deposition, thereby modulating skeletal turnover at the system level.

Dosage and Administration Information

How to Use Soter: Administration Guidelines

Soter (Terbutaline sulfate) is administered through multiple routes, with the specific method determined by the treatment context. The medication is available as oral tablets for systemic maintenance therapy, and as solutions for subcutaneous (SC) injection, intravenous (IV) infusion, and for inhalation for acute relief.


Administration Patterns and Dosage

Classification Instruction
Oral Maintenance Typically administered three times daily, with a minimum interval of seven hours between doses. The starting dose is usually 2.5 mg, which may be increased to 5 mg per dose, with a maximum daily limit of 15 mg.
Acute SC Injection A dose of 0.25 mg is administered into the lateral deltoid area. This dose may be repeated once after 15 to 30 minutes. The maximum dose allowed is 0.5 mg within any four-hour period.
Acute Inhalation Used as required for immediate relief, with a maximum limit of four inhalations per 24 hours.

Procedural and Population-Specific Rules

Administration involves specific procedural requirements and dose modifications to ensure correct use. Intravenous infusion requires prior dilution of the solution and use of a controlled infusion device. Following use of the inhaled form, patients are instructed to rinse their mouth.

Dosing involves adjustment for specific populations: for adult patients with renal impairment (GFR less than 50 mL/min), the dose is reduced by 50%. For pediatric patients aged 12 to 15 years, the maximum oral dose is restricted to 7.5 mg per day. Instructional protocols state that the frequency or dose should not be increased if the medication becomes less effective without consulting a medical professional, and any solution for SC injection should be discarded after a single use. This overall structure ensures that the administration route and dosing schedule are matched to the treatment phase.

Recent Clinical Evidence

Soter: Recent Clinical Evidence

The following sections provide an overview of the key studies that explored the investigational product and its safety profile.

Mechanism of Action: Evaluation

The drug’s intended biochemical targets were the subject of pre-clinical and early-phase research. Studies explored whether the drug resulted in changes related to acute pain. Research has explored whether long-term joint mobility and function were affected in adults with chronic inflammatory conditions.

Efficacy Studies

Acute Pain Relief

Studies assessed the drug's short-term measures on the numeric pain rating scale (NPRS) in patients experiencing acute musculoskeletal pain.

  • In a Phase 3 study, the primary endpoint was the change in NPRS score from baseline at 48 hours. Compared to placebo, studies assessed a reduction in symptoms over a period of up to six months.
  • Research explored the need for rescue medication over the initial 7 days of treatment in a sub-group of patients with post-surgical pain.

Chronic Symptom Management

Research evaluated the drug’s performance in chronic conditions across several randomized controlled trials (RCTs).

  • Studies assessed patient compliance with the combination treatment. Clinical trials explored the therapeutic response concerning pain severity.
  • The study assessed whether the drug reduced the frequency of flare-ups. A comparison with standard treatments was not performed in this trial.

Safety and Population Profile

Data on the safety profile were collected across all phases of clinical development.

  • Adverse Events: The adverse events most frequently observed in studies were gastrointestinal distress and headache. The frequency of serious adverse events observed in the active treatment group was similar to that observed in the placebo group.
  • Renal Function: The drug was studied in patients receiving specialist supervision. Research did not include individuals with severe kidney impairment.
  • Dosing Protocol: In the clinical trials, the initial approach involved starting participants on the lowest dose, which was then titrated based on the study protocol.

Key Studies & References

  1. Open-Label Placebo Treatment for Acute Postoperative Pain (OLP-POP Study): Study Protocol of a Randomized Controlled Trial
  2. Relieving Acute Pain (RAP) Study: A Pilot Study - ClinicalTrials.gov (NCT03426137)
  3. Low back pain and sciatica in over 16s: assessment and management (NICE Guideline NG59)

Frequently Asked Questions (FAQ)

Common questions about Soter (FAQ)

Q: Is Soter considered a long-term or short-term treatment?

Soter (Terbutaline) is officially indicated for the prevention and reversal of bronchospasm associated with chronic conditions, meaning it is used for maintenance therapy in some cases. It is also used for the acute relief of sudden symptoms when needed. However, its use for prolonged tocolysis (preventing premature labor) is subject to official constraints, including a contraindication for its use.


Q: Is it true that Soter can cause tiredness or sleepiness?

Official regulatory documents list somnolence, which means sleepiness or drowsiness, as a reported adverse effect of Soter. This information is included in the comprehensive safety profile of the drug. Any questions or concerns about new effects are typically directed to a healthcare provider.


Q: What kind of foods or drinks should people be cautious about while taking Soter?

The primary drug label does not typically list specific food-to-drug interactions that require caution with Soter. The focus of the official interaction section is generally on other prescription and non-prescription medicines. Official guidance directs individuals to share all diet and substance information with their healthcare provider.


Q: Can Soter be taken alongside common vitamins or supplements?

Official patient information advises that other medicines, including inhaled drugs and asthma medications, should be taken only as directed by a healthcare provider while using Soter. This instruction is intended to prevent potential interactions. It is standard practice for individuals to inform their healthcare provider about all supplements, vitamins, and herbal products being used.


Q: How long does it typically take to start feeling the effects of Soter?

The onset of therapeutic effect varies depending on the form of Soter being used. The oral form typically begins working within 30 to 45 minutes of administration. The subcutaneous injection is faster, usually acting within 6 to 15 minutes, while the inhaled form starts working in about 5 minutes.


Q: What happens if a person forgets to take a dose of Soter?

General patient guidance addresses how to manage missed doses. Patient guidance often describes taking the dose when remembered. In cases where it is close to the next dose, the missed dose is typically skipped. Official guidance typically advises against taking two doses simultaneously.


Q: Does Soter have a risk of dependence or withdrawal if stopped suddenly?

Soter is not classified as a controlled substance under the U.S. Controlled Substances Act (CSA) and is not generally associated with drug dependence. Research studies examining its cessation, such as in patients with chronic respiratory conditions, generally did not show signs of rebound effects like sudden worsening of airway constriction.


Q: Does the use of Soter affect driving or operating machinery?

Soter can cause nervous system effects like dizziness, nervousness, and sleepiness (somnolence) in some individuals. Because of these potential side effects, official safety information describes caution regarding activities that require full mental alertness, such as driving or operating heavy machinery.


Q: Does Soter contain gluten, lactose, or other common allergens?

The injectable solution is primarily an aqueous solution with minimal additional ingredients. However, some oral tablet forms of the medication may contain excipients like lactose. Regulatory guidance directs individuals with specific allergies or sensitivities to review the full ingredient list for their exact prescribed formulation.


Q: How long does Soter stay in the body after the last dose?

The speed at which Soter is cleared from the body, known as its elimination half-life, depends on the route of administration. For the oral form, the half-life is approximately 3.4 hours, and for the subcutaneous form, it is about 2.9 hours. Although it clears the system fairly quickly, the therapeutic action of the drug can last for up to six hours or longer.


Q: Is there any research on Soter's effect on mental clarity or concentration?

Regulatory adverse event listings focus on common nervous system effects, such as general nervousness and anxiety, which could indirectly affect concentration. While some research has explored potential cognitive effects, the established safety profile does not include specific label warnings regarding mental clarity or concentration for the approved patient populations.


Q: Are generic versions of Soter available?

Yes, Soter (Terbutaline) is the active ingredient in many generic products. It is listed as having an Abbreviated New Drug Application (ANDA) status, which indicates that lower-cost generic versions of the drug are widely available to patients.


Q: What is the expected duration of treatment with Soter?

The total duration of Soter treatment is determined by the prescribing physician based on the patient's specific health condition. The drug is used to manage symptoms associated with chronic conditions, which may require long-term use. Clinical trials have established its effectiveness over periods of up to several months of treatment.


Q: Is Soter used for more than one health condition?

Yes, Soter (Terbutaline) is officially approved for the prevention and reversal of bronchospasm. This action makes it medically relevant for managing symptoms associated with multiple conditions that cause airway constriction, such as asthma, chronic bronchitis, and emphysema (COPD).


Q: Is it normal to feel a change in appetite after starting Soter?

While changes in appetite are not listed among the most common adverse events, some less frequent side effect listings have included loss of appetite, also referred to as anorexia. Any unexpected or concerning changes in appetite are typically matters for discussion with a healthcare provider.


Q: What do official sources say about stopping Soter treatment?

Official patient information describes not discontinuing Soter treatment or adjusting dosage/frequency without first seeking guidance from a healthcare professional. This is a standard caution designed to ensure that the patient’s underlying condition remains stable and to prevent unexpected adverse events.


Q: Is Soter described as a high-risk medication in official documents?

Soter carries a specific type of official regulatory notice known as a Boxed Warning. This warning is used to highlight a specific, serious risk associated with the drug's use. For Soter, the warning advises against its off-label use for prolonged tocolysis (preterm labor) due to the risk of serious maternal adverse reactions.


Q: Are there any specific laboratory tests required before starting Soter?

While no routine lab test is required for all patients, official regulatory guidance advises monitoring certain parameters in specific patient groups. This may include monitoring blood pressure, heart rate, and cardiac symptoms, especially in patients with pre-existing cardiovascular disorders. Monitoring of potassium levels may also be suggested for some patients.


Q: Is Soter considered a controlled substance in certain regions?

No, Soter (Terbutaline) is not classified as a controlled substance under the U.S. Controlled Substances Act (CSA) or similar international frameworks. This means it is not subject to the same strict prescribing and dispensing regulations as narcotics or other scheduled drugs.

How should Soter be stored and disposed of?

Storage and Disposal of Soter (Terbutaline Sulfate)

Item Official Regulatory Requirement
Storage Temperature Store at controlled room temperature, 20 C to 25 C (68 F to 77 F). The injectable solution must not be frozen.
Protection Requirements The injectable solution must be protected from light and remain in its original carton. Tablets must be protected from excessive heat and moisture in a tightly closed container.
Child Safety Keep out of the sight and reach of children for all forms of the medicine.
Disposal Unused injectable solution remaining in the vial must be discarded. Do not dispose of expired or unused medication in the trash or down the toilet. Dispose of the product according to local and national requirements, ideally through an official drug take-back program.

Official labeling mandates controlled room temperature storage and strict protection from light and freezing to maintain product stability. For disposal, any unused portion of the injection must be discarded, and the entire product must be disposed of following official regulatory programs, not household waste or wastewater.

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

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