Adrenol

Method of action: Sulfonamide Combination

Treatment option: Bronchitis, Influenza, Diarrhea, Infection, Infection,Urinary Tract, Middle Ear Infection, Nocardiosis, COPD,Acute, Pneumonitis, Pneumonia

Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Adrenol

Property	Description
Active Ingredient	Sulphamethoxazole and Trimethoprim
Form	Tablet, Oral Suspension, Intravenous Solution
Pharmacological Class	Antimicrobial, Combination Antibiotic
General Purpose	To combat susceptible bacterial infections
Origin	Synthetic (Fixed-dose combination)

What Type of Antibiotic is Adrenol?

Adrenol is a trade name for the combination drug Co-trimoxazole (also known as TMP-SMX), which is a synthetic, fixed-dose combination product widely recognized as a broad-spectrum antibiotic and antimicrobial agent. This medication is distinct because it incorporates two active ingredients, Sulphamethoxazole and Trimethoprim, placing it simultaneously within the sulfonamide antibiotic group and the dihydrofolate reductase inhibitor group. This pairing results in an enhanced synergistic effect compared to its individual components. Other popular brand names utilizing this identical formulation include Bactrim and Septra.

Adrenol’s Unique Composition and Forms

The defining characteristic of Adrenol's identity is the precise fixed ratio of its two components, where the combination of Sulphamethoxazole and Trimethoprim is maintained, typically at a 5:1 ratio, across all available forms. This rigorous standardization is crucial for ensuring the intended synergistic effect. Adrenol is commonly supplied as solid oral tablets (including Double Strength formulations), an oral suspension (liquid), and a sterile intravenous solution for injection. This range of dosage form(s), from the liquid oral suspension often intended for pediatric patients to the sterile injection, allows medical professionals to select the optimal route of administration.

What is the General Purpose of This Combination Medicine?

The general purpose of this combination medicine is to provide an enhanced antimicrobial defense, effectively used to overcome bacterial infections as well as select protozoan or fungal infections susceptible to its action. The two components work through a unique dual-sequential blockade action, which is clinically recognized for resulting in a bactericidal effect—meaning the drug actively kills the targeted microorganisms. Co-trimoxazole is considered a cornerstone treatment option for fighting specific susceptible infections. This combined approach delivers a robust solution against a wide variety of pathogens.

Regulatory References

What side effects are possible with Adrenol?

Possible Side Effects and Safety Information

The official safety profile for Adrenol (Co-trimoxazole, a combination of Sulphamethoxazole and Trimethoprim) is structured by regulatory bodies to communicate documented adverse reactions and safety restrictions. Adverse effects are classified by frequency and grouped into System Organ Classes (SOC).

Frequency-Classified Adverse Reactions

Adverse reactions are formally categorized in regulatory documents:

Classification	Examples of Reactions
Very Common	Hyperkalaemia (elevated blood potassium)
Common	Nausea, vomiting, rash
Uncommon	Diarrhoea
Rare	Serious blood disorders (e.g., Agranulocytosis, Aplastic Anemia), hepatic (liver) reactions

Serious Reactions and Safety Considerations

The label documents the possibility of serious adverse reactions, including life-threatening events such as Stevens-Johnson syndrome (SJS) and Toxic Epidermal Necrolysis (TEN), which primarily involve severe skin and mucosal tissue damage. Other serious risks include severe hematological disorders and hypersensitivity reactions.

Safety notes explicitly detail population-specific considerations. Older adults are documented as having an increased susceptibility to severe adverse events, particularly those affecting the blood and skin. Individuals with G6PD deficiency have a documented risk of hemolysis. Furthermore, the medicine is contraindicated by regulatory agencies in cases of severe pre-existing conditions such as marked hepatic parenchymal damage or severe renal insufficiency where monitoring is inadequate, and for certain blood disorders like megaloblastic anemia due to folate deficiency.

Time-related patterns are also noted, with the highest risk for severe skin reactions reported to occur early in the course of treatment.

Overdose and Emergency Response

Overdose and when to seek help

Overdosage with Adrenol (Sulphamethoxazole and Trimethoprim) may result from a single acute massive ingestion or from high doses taken over an extended period (chronic overdosage). Acute manifestations documented in regulatory information include gastrointestinal symptoms such as anorexia, nausea, and vomiting, alongside neurological signs like confusion, dizziness, and drowsiness. In severe cases, documented outcomes include seizure and loss of consciousness.

Chronic overdose is formally associated with the antifolate effects of trimethoprim, potentially leading to signs of bone marrow depression, such as megaloblastic anemia. Furthermore, acute and chronic exposures carry a risk of crystalluria and hematuria, which may result in severe renal insufficiency. Elderly patients are noted as being at increased risk for these severe hematological effects due to potential pre-existing folate deficiency.

The official regulatory guidance mandates that immediate medical attention must be sought upon suspicion of overdosage. Emergency services must be contacted at once if the individual has collapsed, is seizing, or cannot be awakened (loss of consciousness). While no specific antidote is known for the sulfonamide component, management procedures include administering Folinic Acid to counteract the hematological toxicity. Treatment is generally supportive and symptomatic, with adequate hydration recommended to prevent kidney complications.

Therapeutic Uses of Adrenol

What Adrenol Treats: Main Uses and Benefits

The therapeutic application of this compound is commonly used across domains where additional symptomatic support is needed, primarily within the cardiovascular system. The medication is relevant for managing symptoms that interfere with daily comfort due to heightened physiological activity.

This compound is applied in addressing conditions associated with acute or disruptive episodes. It may assist with managing symptoms that create noticeable physiological strain in clinical scenarios involving Hypertension (high blood pressure), Angina Pectoris (chest pain), and Heart Failure. In these contexts, the compound contributes to easing the overall symptom load.

The medication is often used during phases when symptoms become more noticeable, and supportive symptom management is appropriate. The compound is relevant for easing distress and supports the patient during difficult episodes. This therapeutic domain assists with maintaining functional stability and supports general well-being during symptomatic phases.

Quick Fact: Relief for Symptoms related to heightened physiological activity

Regulatory References

NIH DailyMed Labeling for Metoprolol Succinate

Eligibility and Restrictions for Use

Who can and cannot use Adrenol? — Official Regulatory Information

The eligibility for Adrenol (Co-trimoxazole) is strictly defined by regulatory authorities based on age, physiological status, and pre-existing conditions. Use is permitted for adults and pediatric patients 2 months of age and older.

Contraindications are absolute regulatory prohibitions on use. Adrenol is contraindicated in patients with a known hypersensitivity to trimethoprim or sulfonamides, and in infants less than 2 months of age. The medicine must not be used in patients with severe renal insufficiency (CrCl less than 15 mL/min), marked hepatic damage, megaloblastic anemia due to folate deficiency, or severe blood dyscrasias.

Conditional Use is required for certain populations. The label advises caution and close monitoring for older adults due to increased risk of adverse reactions. Patients with moderate renal impairment (CrCl 15–30 mL/min) require a mandated dose reduction. Adrenol is not recommended during the first trimester of pregnancy or near term, and its use is avoided in nursing mothers with infants under 2 months of age due to potential fetal/infant risks.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Adrenol (Co-trimoxazole) has officially documented interactions that primarily result from its effects on drug metabolism and renal excretion, as reported in regulatory documents.

Formal Contraindicated Combinations

Co-administration of Adrenol is contraindicated with Dofetilide due to the high risk of significantly increased Dofetilide plasma concentrations, which can lead to life-threatening heart rhythm abnormalities. Co-administration with Clozapine is also listed as a prohibited combination in some official regulatory summaries.

Pharmacokinetic and Pharmacodynamic Interactions

Adrenol is documented to potentiate the anticoagulant effect of Warfarin and to prolong the half-life of Phenytoin, increasing the exposure to these co-administered medicines. The Trimethoprim component can inhibit renal secretion, leading to increased plasma levels of Digoxin (notably in the elderly) and substances like Lamivudine. A significant pharmacodynamic interaction is the combined effect with ACE inhibitors or Potassium-Sparing Diuretics, which raises the risk of clinically relevant hyperkalaemia.

Mechanism of Action

Dual-Sequential Enzyme Inhibition and Synergy

Adrenol, a combination antimicrobial, acts by executing a dual-sequential blockade of the bacterial folic acid synthesis pathway. The component Sulphamethoxazole targets and competitively inhibits the bacterial enzyme Dihydropteroate Synthase (DHPS). Simultaneously, Trimethoprim inhibits the subsequent enzyme, Dihydrofolate Reductase (DHFR). This strategy is highly selective, as Trimethoprim exhibits 10^5-fold greater affinity for the microbial DHFR than for the human enzyme, preserving host metabolism.

This synchronized inhibition generates a significant synergistic effect. By arresting the production and regeneration of Tetrahydrofolic Acid ( THF), the essential co-factor needed for C1 transfer, the drug prevents the subsequent synthesis of DNA, RNA, and proteins. The cascade transforms the individual components' bacteriostatic (growth-inhibiting) actions into a bactericidal (killing) physiological outcome, directly resulting in the elimination of the microbial population. The functional activity is constrained by the presence of PABA or the development of genetic resistance in the target enzymes.

Dosage and Administration Information

Official Administration Guidelines for Adrenol (Co-trimoxazole)

Adrenol is available for both oral and intravenous (IV) infusion administration, allowing medical professionals to select the appropriate route based on the clinical scenario. The two primary oral forms are the standard tablet (400 mg Sulfamethoxazole / 80 mg Trimethoprim) and the Double Strength (DS) tablet (800 mg SMX / 160 mg TMP).

Dosing and Administration Schedule

The standard adult dosing for most acute infections is typically the equivalent of 800 mg SMX and 160 mg TMP, administered twice daily (every 12 hours). However, treatment for severe conditions, such as Pneumocystis jirovecii Pneumonia (PJP), requires a higher, weight-based regimen of 75 to 100 mg/kg SMX and 15 to 20 mg/kg TMP per 24 hours, which is divided into doses given every 6 hours. Conversely, prophylactic use for prevention is often standardized to the DS tablet taken once daily.

Procedural Use and Adjustments

Oral doses must be taken with a full glass of water and may be taken with or after food. The Intravenous Solution is not administered as a rapid injection; it must first be diluted in an appropriate infusion fluid and administered over a period of 60 to 90 minutes. Dosing requires adjustment in patients with renal impairment: if the Creatinine Clearance is between 15 and 30 mL/min, the dosage is officially reduced to half the standard regimen. Treatment durations are fixed, typically ranging from 5 to 14 days for acute courses to 14 to 21 days for treating PJP.

Recent Clinical Evidence

Research evidence / Overview of studies for Adrenol

This overview describes the scope of clinical research and the types of findings reported for Adrenol (Co-trimoxazole), based solely on authoritative scientific and regulatory sources. This information is intended to contextualize the evidence base and is not clinical advice.

Evidence for Use in Urinary Tract Infections (UTIs)

Research has widely explored Adrenol's application in conditions characterized by bacterial presence in the urinary tract. The evidence base includes many Randomized Controlled Trials (RCTs) and large Systematic Reviews that evaluate Adrenol in settings where other antimicrobial options are also studied. Studies explored endpoints primarily in non-pregnant adults and adolescents with uncomplicated UTIs, with findings describing the patterns observed related to microbiological eradication.

What remains uncertain in this field is defined by the variability in bacterial susceptibility. The research highlights that the applicability of the study findings is dependent on local patterns of bacterial resistance, which may change significantly between different geographical locations and over time.

Evidence for Use in Pneumocystis Pneumonia (PCP)

Adrenol was evaluated in numerous specialized studies for both the treatment and the prevention (prophylaxis) of Pneumocystis jirovecii pneumonia (PCP). The research primarily involved RCTs and long-term observational studies in specific, highly vulnerable populations, particularly immunocompromised adults and children.

Evidence so far indicates that research explored survival and included observations of the frequency of PCP diagnosis in these specific cohorts. A key limitation is that the vast majority of findings describe group patterns in highly specialized patient populations. Research provides limited insight into its role in other, less common causes of immune compromise.

What is Still Uncertain About Adrenol's Research

The broader evidence landscape contributes to understanding symptom patterns, but several areas of uncertainty remain.

Bacterial Resistance: The primary limitation noted by research is the reported variability in bacterial susceptibility that may affect the generalizability of findings. The research findings described in historical studies may not translate directly to current clinical settings without local confirmation of bacterial sensitivity.
Long-Term Impact: While short-term clinical outcomes are well-documented, long-term effects are not fully established for all indications, and follow-up durations were limited in certain treatment-focused trials.

Frequently Asked Questions (FAQ)

Common questions about Adrenol (FAQ)

Q: Who are the primary patient groups that Adrenol is approved to treat?

A: The official regulatory documents state that the medicine is approved for use in adults and pediatric patients who are 2 months of age and older. It is indicated for infections caused by susceptible bacteria, including specific urinary tract infections and specialized treatments like Pneumocystis jirovecii Pneumonia (PJP).

Q: Is Adrenol a prescription-only medicine?

A: Adrenol (Co-trimoxazole) is classified as a prescription-only medicine (Rx-only or POM) in the US, UK, and other major markets. It is only available with a valid prescription from a healthcare provider.

Q: Is Adrenol classified as a controlled substance in the US or other major markets?

A: According to official US, UK, and other major market regulations, Adrenol (Co-trimoxazole) is classified as a prescription-only medicine and is not designated as a federally controlled substance.

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

A: Official documents advise that if extended treatment is necessary, it is advised that patients maintain adequate fluid intake to help prevent crystalluria (crystal formation in the urine). Long-term use may also require careful monitoring due to the potential for effects like bone marrow suppression.

Q: How long does it usually take for Adrenol to start showing its effects?

A: According to pharmacokinetic data, the components of this medicine are rapidly absorbed after oral administration. Peak concentrations in the blood typically occur between one and four hours after taking a dose.

Q: What is the typical duration of action for Adrenol after one dose?

A: Official pharmacokinetic data shows that effective levels of the medicine persist in the blood for up to 24 hours after a therapeutic dose. This duration reflects the time needed to maintain effective levels in the body for acute infections.

Q: Why do some users report that Adrenol seemed to stop working after a period of time?

A: Research indicates that the medicine's effectiveness is constrained by the bacteria's level of susceptibility. Patterns of bacterial resistance are known to change significantly between different locations and over time, which can affect the medicine's efficacy for some infections.

Q: Is it typically possible to stop taking Adrenol suddenly?

A: Official patient information consistently states that the full course of treatment should be completed as prescribed by a healthcare professional. This is the standard advice even if symptoms improve or the infection seems to have cleared up before the treatment duration is finished.

Q: How should a generally missed dose of Adrenol be handled according to patient information?

A: Official patient counseling generally advises that if a dose is missed, it should be taken as soon as it is remembered, unless it is very close to the time for the next scheduled dose. Official guidance emphasizes that a double dose should not be taken to make up for a forgotten one.

Q: What are the recognized signs of a serious allergic reaction to Adrenol?

A: The official labels note that serious allergic reactions may be preceded by recognizable signs that warrant consultation with a healthcare professional. These may include the onset of high fever, severe headache, blistering of the skin, or the development of sores or ulcers in the mouth or on the lips.

Q: Do the side effects of Adrenol tend to lessen over time?

A: Official labeling confirms that the highest risk for serious skin reactions, such as Stevens-Johnson syndrome, is documented to occur early in the course of treatment. The official product information does not provide a general statement on whether all common, less severe side effects tend to lessen over time.

Q: What are the official details on Adrenol causing weight changes?

A: The official list of possible adverse effects includes weight loss, although its frequency is generally not known or is considered rare.

Q: Does Adrenol commonly affect sleep patterns?

A: Insomnia (difficulty sleeping) is listed as a possible side effect in the official adverse reactions profile.

Q: What information is available on Adrenol and its potential effect on mental health conditions?

A: Rare neurological and psychiatric side effects are reported in the official adverse reaction data, including confusion, hallucinations, and, very rarely, psychosis. If such effects are experienced, the medicine may be discontinued by the prescribing professional.

Q: Is it true that Adrenol can affect libido or sexual function?

A: While not listed as a common side effect for patients, the sulfamethoxazole component belongs to a class of drugs that have been studied. This research has noted potential adverse effects on sperm count and motility, particularly with long-term use.

Q: Can Adrenol be used by people with pre-existing conditions like high blood pressure?

A: Regulatory warnings address the combination of this medicine with certain high blood pressure treatments. Specifically, combining Adrenol with ACE inhibitors or potassium-sparing diuretics may increase the risk of high potassium levels (hyperkalaemia). This potential interaction is a key point for discussion and monitoring with a healthcare provider.

Q: Can people with diabetes safely use Adrenol?

A: Use of this medicine requires caution in patients with diabetes, primarily due to a documented interaction with the drug Metformin. This interaction can increase the risk of a serious condition called lactic acidosis. The official guidance is that blood glucose levels should be monitored closely when the medicine is used in this population.

Q: Does Adrenol typically require any special monitoring like blood tests?

A: Monitoring may be required for patients taking this medicine, especially if they are on high-dose or long-term treatment. Monitoring via tests for kidney function and blood counts may be indicated for patients with certain underlying conditions, such as kidney impairment or suspected folate deficiency.

Q: Are there any restrictions on driving or operating machinery while taking Adrenol?

A: Official labeling notes that formal studies evaluating the effects of Adrenol on the ability to drive and operate machinery in patients have not been conducted.

How should Adrenol be stored and disposed of?

The storage and disposal of Adrenol (Co-trimoxazole/Sulphamethoxazole and Trimethoprim) must strictly adhere to regulatory requirements to maintain its stability.

Official Storage Conditions

Dosage Form	Required Storage Temperature	Environmental Protection
Tablets & Oral Suspension	20 C to 25 C (68 F to 77 F)	Protect from moisture
IV Solution (Concentrate)	15 C to 30 C (59 F to 86 F)	Protect from light; Do not refrigerate or freeze

All forms must be kept in the original container or carton. The oral suspension must be kept tightly closed and any opened container must be discarded after the period specified in the official labeling (e.g., 16 days or 3 months). The product must be kept out of the sight and reach of children.

Disposal Instructions

Expired or unused Adrenol should not be disposed of in the household trash or poured into wastewater. Medicines must be returned to a pharmacist or a designated drug take-back program for proper disposal, in accordance with local environmental regulations.

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