Sole

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English Sole

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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 Sole

Quick Facts

Property	Description
Active ingredient	English sole extract (Parophrys vetulus)
Form	Solution for injection
Pharmacological class	Allergenic Extract
Common use	Diagnosis of fish allergy
Origin	Natural (Animal-derived)

What is Sole and What Does it Contain?

Sole is a specialized diagnostic agent belonging to the Allergenic Extract pharmacological class, used exclusively to identify an allergic sensitivity in patients. The active ingredient in this single-ingredient product is English sole extract, which is derived from the fish species Parophrys vetulus, establishing its origin as natural and animal-derived protein. This class of products is clinically recognized for its role in identifying specific, immediate-type hypersensitivities.

The product is typically supplied as a sterile solution for injection, distinguishing it from orally administered diagnostic tests. It is designed for parenteral administration, specifically via the intradermal or subcutaneous route, strictly within a clinical setting. Notably, this extract is a non-standardized preparation, a characteristic common to many food-derived biologicals. This preparation is targeted toward individuals suspected of having an allergy to English sole proteins.

What is the Purpose of English Sole Extract?

The fundamental purpose of the English sole extract is to aid in the clinical diagnosis of a food allergy or hypersensitivity specific to the proteins of the English sole fish. It is crucial to understand that this product is not a treatment and is not intended to relieve or cure allergic symptoms.

As a diagnostic tool, the preparation's function is to introduce a controlled, minute amount of the suspected allergen into a patient's system. This exposure is designed to elicit a predictable, localized immune recognition response only if the individual is already sensitized to the protein. The observable reaction provides the objective evidence necessary for healthcare professionals to establish a definitive diagnosis. This process, supported by established clinical protocols for allergen testing, offers the foundational certainty required for proper patient management, such as implementing necessary dietary restrictions.

What side effects are possible with Sole?

Safety Information and Possible Side Effects for Sole

The safety profile of Sole is formally documented and categorized based on data derived from clinical trials and post-marketing surveillance, consistent with governmental regulatory standards.

Adverse Reaction Scope

The full range of adverse reactions is classified using the MedDRA System Organ Class (SOC) framework (e.g., Gastrointestinal Disorders, Nervous System Disorders, Skin and Subcutaneous Tissue Disorders). The incidence of these reactions is assigned based on the CIOMS frequency categories (e.g., Very Common, Common, Uncommon, Rare) determined by the observed rates in relevant patient populations.

Serious and Clinically Significant Events

Official regulatory labeling for Sole details serious adverse reactions, defined as events resulting in outcomes such as death, life-threatening experience, or initial or prolonged hospitalization. Additionally, clinically significant adverse reactions that warrant a formal warning are included in the risk profile.

Classification	Example Categories
Serious Events	Hypersensitivity reactions, hepatotoxicity, organ-specific failure
Frequency	Very Common (ge 1/10), Common (1/100 to <1/10)

Safety Restrictions and Monitoring

The regulatory documentation identifies formal safety limitations, including Contraindications, which are patient conditions where the risk of use is unacceptable and the drug must not be administered. Special Warnings and Precautions for Use detail situations requiring enhanced monitoring or cautious administration, such as use in patients with pre-existing renal or hepatic impairment.

Safety monitoring may involve periodic assessments of organ function, but the specific monitoring schedule is not part of the risk profile description. Dose- or exposure-related patterns, such as an increased risk of certain adverse effects during the initiation phase of therapy, are only included if explicitly stated in the official regulatory texts.

This structure establishes the comprehensive set of risks officially associated with Sole, providing a factual basis for understanding its safety limitations as determined by government health authorities.

Overdose and Emergency Response

The official regulatory profile for an overdose of Sole (English sole extract) defines the event as a severe systemic hypersensitivity reaction (anaphylaxis) resulting from extreme patient sensitivity or an excessively large administered dose. These life-threatening reactions require immediate attention and are explicitly stated to carry the risk of fatal outcomes.

Overdose Manifestations and Outcomes

System Affected	Manifestations
Respiratory	Wheezing, dyspnea, respiratory obstruction
Systemic/Skin	Urticaria, angioedema, hypotension, pruritus, dizziness
Severe Outcomes	Shock, coma, life-threatening respiratory failure

Required Emergency Action

Patients must seek immediate medical attention for any severe reactions that occur during or after leaving the physician's office. Regulators require that emergency measures and personnel trained in their use are available at the time of administration. A mandatory observation period of 20 to 30 minutes is required following injection to monitor for delayed reactions.

The management of overdose is equivalent to the treatment of a severe allergic emergency. While no specific antidote for the extract is documented, the official labeling mandates the immediate availability of Epinephrine 1:1000 as the critical supportive measure. Specific warnings exist for unstable asthmatics, who are at an increased risk for a fatal outcome, and for pregnant patients, where a systemic reaction could cause uterine contractions.

Therapeutic Uses of Sole

English sole extract is primarily utilized as a specialized diagnostic agent for identifying the specific cause of a suspected allergic reaction. Its core benefit is generally associated with supporting risk management and contributing to disease prevention through avoidance.

Conclusive Identification and Management

The primary use involves identifying the specific hypersensitivity to the English sole protein in individuals presenting with symptoms related to heightened physiological activity suggestive of an allergy. Its use is relevant in conditions presenting with systemic or localized discomfort, such as cutaneous manifestations, gastrointestinal distress, or respiratory symptoms, where fish consumption is the suspected trigger. Allergenic extracts are used for diagnostic testing in patients whose histories indicate they experience allergic symptoms. This diagnostic certainty is considered relevant in contexts involving heightened systemic burden when patients exhibit symptom clusters that may become disruptive.

The confirmed diagnosis assists with establishing clarity for effective avoidance strategies, which generally supports a reduction in the risk of acute or disruptive episodes. This clarity contributes to easing the overall symptom load and helps establish necessary safety planning. “The confirmed diagnosis provides support that generally assists with maintaining functional stability.”

Quick Fact: Prevention via Diagnosis
Benefit	Contributes to improved comfort by minimizing future risk.
Context	Applied when confirmation is needed for strict dietary management.

Regulatory References

diagnostic testing in patients whose histories indicate they experience allergic symptoms

Eligibility and Restrictions for Use

Who Can and Cannot Use Sole?

Eligibility for Sole (English sole extract), a diagnostic Allergenic Extract, is strictly defined by regulatory documents based on the patient's underlying health status and physiological stability.

Absolute Contraindications

Sole is contraindicated in individuals with severe, unstable, or uncontrolled asthma. Use is also prohibited for patients with a documented history of any severe systemic or local allergic reaction to an allergen extract.

Restricted and Conditional Use

Use is conditionally contraindicated in several populations. These include pregnant patients and individuals with conditions such as cardiovascular disease, emphysema, diabetes, or a bleeding diathesis. For these groups, the diagnostic benefit must formally justify the potential risk.

Administration must be temporarily withheld if the patient is experiencing an infection or flu accompanied by fever or severe respiratory symptoms. Sole should be used with extreme caution in patients with unstable or steroid-dependent asthma.

Age-Related Eligibility

Pediatric use is generally allowed, with dosage guidelines similar to adults, and is subject to the same strict contraindications. No specific restrictions based solely on advanced age apply to the geriatric population, but all adult contraindications remain relevant.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documentation confirms that interactions with English sole extract, consistent with its function as a protein-based diagnostic Allergenic Extract, fall into two main categories: those affecting emergency treatment and those suppressing diagnostic results.

Interactions Affecting Emergency Treatment

Co-administration with beta-blocker medications is noted as a clinically relevant pharmacodynamic interaction. Patients who are receiving beta-blockers may exhibit a reduced or impaired response to the effects of epinephrine and other inhaled bronchodilators, which are the standard medical agents used to treat a severe systemic reaction should one occur during the diagnostic procedure. No drug combinations are formally classified as contraindicated.

Interactions Affecting Diagnostic Accuracy

Agents that suppress the immediate hypersensitivity response can interfere with the diagnostic outcome, potentially leading to inaccurate results. These substances, which include antihistamines, tricyclic antidepressants, and topical corticosteroids, must be separated from testing according to mandatory timing rules.

Interacting Product	Minimum Separation Rule (Example)
Standard-acting Antihistamines	Must be ceased for at least 24 hours prior to skin testing.
Long-acting Antihistamines	May require cessation for up to 6 to 8 weeks prior to testing.

No interactions involving metabolic enzymes (CYP), drug transporters, food, alcohol, or herbal products are documented in the official prescribing information.

Mechanism of Action

Sole is a small-molecule compound that acts as a competitive antagonist at muscarinic acetylcholine receptors in the urinary bladder, exhibiting the highest binding affinity for the M3 subtype, followed by M1 and M2. It accumulates selectively in the tissue of the lower urinary tract. The drug modulates intracellular signaling by physically blocking the M3 receptor, preventing the binding and action of the endogenous agonist, acetylcholine. This antagonism inhibits the Gq-protein coupled cascade that typically leads to an increase in intracellular calcium concentration. The downstream consequence of M3 receptor blockade is the functional prevention of detrusor muscle contraction. Concurrently, antagonism of M2 receptors may prevent non-cholinergic-mediated smooth muscle contraction in the bladder wall. This dual action results in a sustained reduction of bladder smooth muscle tone and decreases overall contractility.

Dosage and Administration Information

Sole (Solifenacin Succinate) is a medication classified as an antimuscarinic agent, prescribed for the treatment of Overactive Bladder (OAB) with symptoms that include urinary incontinence, urgency, and frequent urination.

Administration and Dosage

Sole tablets are intended for oral administration and must be swallowed whole with water; they should not be crushed, chewed, or split. The medication can be taken with or without food. To maintain consistent therapeutic levels, it is generally recommended to take the dose at approximately the same time each day.

The typical starting dose for adults is 5 mg once daily. If the 5 mg dose is well-tolerated but symptoms are inadequately controlled, the dose may be increased to 10 mg once daily, as determined by a healthcare provider.

Patient Subgroup	Maximum Recommended Daily Dose
Standard Adult	10 mg
Severe Renal Impairment (creatinine clearance < 30 mL/min/1.73 m^2)	5 mg
Moderate Hepatic Impairment (Child-Pugh B)	5 mg
Concomitant use with strong CYP3A4 inhibitors (e.g., Ketoconazole)	5 mg

Important Considerations

Missed Dose: If a dose is forgotten, the next dose should be taken at the regularly scheduled time on the following day. Do not take two doses in the same day to compensate for the missed one.
Duration of Use: Sole is often taken for an extended period, and a healthcare professional will periodically review the treatment to ensure continued efficacy. Patients should not discontinue the medication without consulting their prescriber, even if symptoms improve.

Recent Clinical Evidence

Research Evidence: Overview of Studies for English Sole Extract

Evidence for Use in Diagnosing Fish Allergy

Research on the use of English sole extract was studied for its role in diagnostic accuracy studies, which examined the extract's ability to identify IgE-mediated allergy in patients with a suspected history. The extract is a non-standardized allergenic extract intended for use in identifying immediate-type hypersensitivity to the English sole protein. Studies explored the patterns observed when the extract is used in a skin test, comparing the results to the reference standard, the Double-Blind Placebo-Controlled Food Challenge (DBPCFC), which is generally used as the clinical reference standard. Research has explored how test results relate to outcomes capturing phases of heightened symptom activity, such as cutaneous manifestations or gastrointestinal distress.

Study Endpoints and Diagnostic Outcomes Examined

The studies and regulatory analyses that have evaluated this class of diagnostic agents examined several high-level outcomes related to diagnostic performance. Research explored how well the skin test results correlate with the findings of the gold standard to measure its sensitivity and specificity. Studies also monitored the relationship between the measured skin reaction and blood levels of allergen-specific IgE antibodies. These findings relate to IgE sensitization, but research does not determine whether an individual will respond similarly.

Evidence in Special Populations and Follow-up

The research was evaluated in mixed age groups, including both children and adults. However, data for certain groups, such as those with particular comorbidities, remain insufficient. Because the product is diagnostic, the follow-up durations were limited to the immediate physiological response after the test is administered. Consequently, there is limited information for long-term outcomes, and long-term effects are not fully established.

Study Limitations and Areas of Uncertainty

A primary concern research describes is the variability of allergens within the extract, and inconsistent potency across different production lots was observed in some studies. This lack of standardization was associated with diagnostic uncertainty, and false negative results were observed in some studies. Comparative evidence is lacking against newer methods. Furthermore, the evidence shows that cross-reactivity with proteins from other fish species may occur, and findings were mixed across studies.

Key Studies & References

Frequently Asked Questions (FAQ)

Common questions about Sole (FAQ)

Q: How long does it take for Sole to start working to relieve OAB symptoms?

Studies and official information indicate that peak plasma levels (the highest concentration of the drug in the blood) are typically reached within 3 to 8 hours after a dose. However, significant and noticeable improvement in overactive bladder symptoms was generally observed in clinical trials after approximately 12 weeks of continuous use.

Q: What should I do if I accidentally take more than the recommended dose of Sole?

According to the official product information on overdose, taking more than the recommended dose can result in severe antimuscarinic effects. This may potentially lead to serious events, including a decrease in the level of consciousness or mental status changes. Regulatory labeling states that individuals who suspect an overdose should seek emergency medical attention.

Q: Can I drink alcohol while taking Sole?

Official regulatory documents indicate that combining Sole with alcohol may increase drowsiness, which is a reported central nervous system side effect. Furthermore, excessive intake of alcohol may increase the frequency of urination, which could potentially decrease the drug's effectiveness in managing symptoms.

Q: What is the most serious side effect associated with Sole?

Regulatory documents list serious adverse reactions that are potentially life-threatening, such as angioedema (swelling of the face, lips, tongue, and/or larynx) and anaphylactic reactions (severe allergic reactions). This information establishes the drug’s comprehensive safety profile.

Q: What happens if I stop taking Sole suddenly?

Studies and official information indicate that stopping this medication abruptly may lead to the immediate return or recurrence of overactive bladder symptoms. Regulatory information advises patients to consult with their healthcare provider before discontinuing treatment to help manage symptoms and prevent potential relapse.

Q: Is English Sole Extract safe for use in children?

Official regulatory documentation indicates that allergenic extracts, including English Sole Extract, have been routinely used in children for diagnostic purposes. No special safety problems or specific hazards have been identified with its use in pediatric populations. The dosage guidelines used for children are the same as those used for adults.

How should Sole be stored and disposed of?

How to Store and Dispose of English Sole Allergenic Extract

English Sole Allergenic Extract must be stored under strict refrigeration conditions, maintained within a temperature range of 2 C to 8 C (36 F to 46 F). Exposure to temperatures above this range may adversely affect the stability and potency of the solution. The required refrigeration is necessary to minimize the rate of potency loss for this diagnostic agent.

Prior to use, the injectable solution must be visually inspected for any particulate matter or discoloration and must be discarded if either is observed. The product should not be used past the manufacturer's expiration date.

Disposal of unused or expired extract, as well as the containers, must follow established local regulations for pharmaceutical waste.

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