Cidophage

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Cidophage

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 Cidophage

Cidophage: What Is It?

Property Description
Active ingredient Metformin Hydrochloride (INN)
Form Oral tablets (Immediate- or Extended-Release)
Pharmacological class Biguanide, Antihyperglycemic agent
Common use Systemic blood glucose control
Origin Synthetic

Cidophage is a synthetic, prescription-only medication classified as an antihyperglycemic agent, centrally important in the management of chronic high blood glucose levels. Its active compound, Metformin Hydrochloride (INN), is the established pharmaceutical entity responsible for the drug’s effects. This core component places Cidophage within the distinct Biguanide pharmacological class. The medication is recognized as the first-line oral therapy for the initial management of Type 2 Diabetes Mellitus.


Composition and General Benefit

Cidophage is prepared exclusively as an oral dosage form, specifically as tablets, which may be immediate-release or extended-release formulations. This form dictates the sole oral route of administration. The synthetic nature of the compound is combined with an inert pharmaceutical base to ensure the precise systemic delivery of the active Metformin Hydrochloride. While Metformin Hydrochloride is also available under other brands and as a generic, Cidophage focuses on providing both standard and extended-release formulations.

The general benefit of Cidophage is to systematically establish and maintain better glucose control by improving the body's natural handling of sugar. The Biguanide class, through its mechanisms, is associated with protective health benefits beyond glucose lowering, including a reduction in major cardiovascular events for diabetic patients. The drug works primarily by decreasing the amount of glucose produced by the liver, enhancing the sensitivity of muscle and fat cells to the effects of the body's own insulin, and reducing the quantity of glucose absorbed from the intestine. This collective, non-insulin-dependent approach is the foundational purpose of its use.

What side effects are possible with Cidophage?

Possible Side Effects and Safety Information

The safety profile for Cidophage (Metformin) is officially structured by regulatory authorities based on the frequency and system-organ class of documented adverse reactions. These classifications establish the risk profile without providing prescriptive instructions.


Frequency-Classified Adverse Reactions

The most frequent side effects are related to the gastrointestinal system, particularly during the initial phase of treatment. Official classifications categorize these effects as follows:

Classification Examples of Effects
Very Common Gastrointestinal disturbances (e.g., diarrhea, nausea, vomiting, abdominal pain)
Common Taste disturbance (metallic taste)
Very Rare Lactic Acidosis, Vitamin B12 deficiency, and skin reactions (e.g., pruritus, urticaria)

Serious Metabolic Safety Risk

The primary serious safety focus associated with Metformin is Lactic Acidosis, which is classified as a very rare but clinically significant metabolic complication requiring urgent intervention. This risk is specifically highlighted in regulatory safety documents.

Safety Constraints and Considerations

Metformin's safety profile is critically dependent on adequate organ function. The medication is generally contraindicated in patients with severe renal impairment (defined by specific eGFR levels) due to the significantly increased risk of Lactic Acidosis. Caution is also advised regarding its use in individuals with pre-existing hepatic disease.

Furthermore, official safety summaries note that gastrointestinal effects are more frequent at the start of therapy and often resolve with continued use. Long-term exposure is associated with the potential for decreased serum Vitamin B12 levels, which may necessitate periodic monitoring.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory profile for Cidophage (Metformin Hydrochloride) overdose focuses primarily on the risk of Lactic Acidosis, which is classified as a rare but severe and potentially fatal metabolic complication. Overdose may present with non-specific symptoms that include general malaise, muscle pain (myalgias), respiratory distress, increasing somnolence, vomiting, and hypothermia. Specific laboratory findings documented in regulatory labeling include significantly elevated blood lactate levels (typically over 5 mmol/L) and the presence of anion gap metabolic acidosis.

Required Emergency Actions

The government-mandated action is to seek immediate medical attention or call emergency services immediately if Lactic Acidosis is suspected, or if signs such as collapse, seizures, or trouble breathing are observed. The risk of severe toxicity is specifically noted as increased in patients with renal impairment or advanced age.

Management and Antidote Information

Official labeling states that no specific antidote is known or available for Metformin overdose. Management is symptomatic and supportive. Prompt hemodialysis is the documented procedure required to remove the accumulated drug from the blood and correct the severe acidosis, thereby preventing potentially fatal outcomes like cardiovascular collapse.

Therapeutic Uses of Cidophage

What Cidophage treats: Main Uses and Benefits

Cidophage (Metformin) is commonly used to help manage the systemic symptoms associated with chronic metabolic dysfunction. This medication is often the initial oral therapeutic choice for the management of Type 2 Diabetes Mellitus. It addresses hyperglycemia and helps manage the underlying condition of insulin resistance, common symptomatic patterns linked to Type 2 Diabetes.

This medication may assist in the long-term management of chronic high blood sugar, which may help contribute to reducing the risk of severe complications linked to organ-specific functional stress. Cidophage is also applied in clinical contexts, such as Polycystic Ovary Syndrome (PCOS), and may assist in the prevention or delay of disease progression in patients with prediabetes.

“This foundational therapy supports the patient during episodes of heightened discomfort by easing the overall symptom load associated with chronic metabolic disease.”

This medication is relevant across therapeutic areas involving persistent systemic imbalance and is considered for its long-term systemic protective benefits, supporting cardiovascular health in diabetic patients.


Quick Fact: Relief for Metabolic Dysregulation Cidophage assists with maintaining functional stability by addressing the underlying metabolic dysfunction, thereby supporting general well-being during symptomatic phases.

Eligibility and Restrictions for Use

Cidophage (Metformin) is subject to strict eligibility rules based on regulatory labeling, primarily due to the risk of lactic acidosis. Official rules define which populations may use the medicine and which are absolutely excluded.

Contraindicated Populations

Cidophage is contraindicated and must not be used by patients with:

  • Severe renal impairment (eGFR < 30 mL/min/1.73 m^2).
  • Metabolic acidosis, including diabetic ketoacidosis.
  • Acute or unstable heart failure or conditions associated with tissue hypoxia.
  • Known hypersensitivity to Metformin.

Age and Condition-Based Eligibility

  • Age-Based Use: Approved for adults and pediatric patients 10 years of age and older (for immediate-release formulations). Older adults (65 years and older) require more frequent monitoring of renal function.
  • Restricted Use: The initiation of treatment is not recommended if eGFR is between 30 and 45 mL/min/1.73 m^2.
  • Hepatic Restriction: Use should generally be avoided in patients with hepatic impairment. The medication must be temporarily discontinued before or at the time of iodinated contrast imaging procedures and certain surgeries.

What should I know about interactions with other medicines?

Cidophage Interactions with other medicines and products

Cidophage (Metformin Hydrochloride) has documented interaction patterns that primarily relate to its systemic clearance and effects on blood glucose levels, as detailed in regulatory documents.

Contraindicated Combinations and Timing Rules

Co-administration with Iodinated Contrast Agents (used for X-ray procedures) is contraindicated due to the risk of acute changes in kidney function, which can lead to Metformin accumulation and increase the risk of lactic acidosis. Cidophage must be temporarily discontinued at the time of or before the procedure and withheld for at least 48 hours afterward, only resuming when renal function is confirmed as normal.

Drug-Drug and Drug-Substance Interactions

The most significant pharmacokinetic interactions involve medicines that inhibit renal tubular transport systems (specifically OCT2 and MATE). Co-administration with these Cationic Drugs, such as Cimetidine, officially increases Metformin plasma concentrations and reduces its renal clearance. Additionally, drugs classified as Hyperglycemic Agents (e.g., corticosteroids, thyroid products) may counteract the glucose-lowering effect of Cidophage, while Insulin and Insulin Secretagogues may result in an additive glucose-lowering effect.

Regarding substances, acute or chronic intake of excessive alcohol is officially associated with a significantly increased risk of lactic acidosis. For the immediate-release formulation, co-administration with food reduces the extent of absorption, resulting in a lower mean C max and AUC.

Mechanism of Action

Cidophage, an oral biguanide, is transported into hepatocytes primarily by the organic cation transporter 1 (OCT1). Its principal molecular interaction is the mild, non-competitive inhibition of the mitochondrial respiratory chain Complex I. This inhibition reduces the intracellular adenosine triphosphate (ATP) levels, consequently increasing the adenosine monophosphate (AMP):ATP ratio, which functions as an intracellular energy sensor.

This altered energy status results in the allosteric activation of AMP-activated protein kinase (AMPK). Activated AMPK then phosphorylates and modifies key enzymes and transcription factors, suppressing the expression and activity of enzymes critical for gluconeogenesis (such as phosphoenolpyruvate carboxykinase and glucose-6-phosphatase) and lipogenesis within the liver. This cascade leads to a reduction in hepatic glucose output. Additionally, the compound exhibits AMPK-independent mechanisms, including inhibition of glycerol-3-phosphate dehydrogenase (GPD2) and suppression of glucagon signaling via reduced cyclic AMP (cAMP) levels. Downstream consequences involve modulation of systemic glucose dynamics and lipid metabolism.

Dosage and Administration Information

Cidophage is intended exclusively for oral administration, utilizing either immediate-release (IR) or extended-release (ER) tablets. The administration protocol is defined by a necessary titration phase and the relationship between intake and food. Adults typically initiate therapy with a low dose, such as 500 mg of the IR form taken twice daily, or 850 mg once daily. The dose is then gradually adjusted in small increments, often over a period of one to two weeks, until the maintenance dose is reached. The maximum daily dose for IR tablets is 2550 mg, taken in divided doses, while ER tablets have a standard maximum of 2000 mg per day.

To ensure proper use, IR tablets must be taken with meals throughout the day to support tolerability, whereas the ER formulation is typically taken once daily with the evening meal. Crucially, the ER tablets must be swallowed whole and cannot be crushed, chewed, or dissolved, as this would compromise the time-release mechanism defined by the dosage form. If a dose is missed, the standard approach is to skip the missed dose and resume the normal schedule at the next scheduled time.

Specific procedural conditions govern the use of this medicine in the context of other medical events. Cidophage is temporarily discontinued at the time of, or prior to, any procedure that involves the intravascular injection of iodinated contrast agents and withheld for at least 48 hours afterward. Additionally, dosing is contingent upon renal function, as therapy is not advised for initiation in certain patients with moderate renal impairment and is contraindicated when the estimated Glomerular Filtration Rate (eGFR) falls below 30 mL/min/1.73 m^2.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Cidophage

Cidophage (Metformin) was studied for decades, with clinical studies exploring patterns related to various metabolic conditions. The evidence base is structured around large-scale, long-term Randomized Controlled Trials (RCTs), as well as high-level Systematic Reviews and Meta-analyses that summarize data from many different studies.


Evidence for Use in Type 2 Diabetes Mellitus

Research exploring the use of Cidophage in contexts of chronic hyperglycemia was studied for its effect on measures of systemic stability and long-term clinical variables. Studies examined adults newly diagnosed with the condition, particularly those who are overweight or obese. Researchers monitored changes in markers of systemic blood glucose control, such as HbA1c, and monitored rates of major cardiovascular events and all-cause mortality as endpoints.

What remains uncertain is that long-term outcomes are not fully established regarding all-cause and cardiovascular mortality across all patient subgroups studied. Comparative evidence is lacking for some of the newest medications used for Type 2 Diabetes, meaning research is ongoing to fully contextualize these findings.


Evidence for Use in Prediabetes (Delaying Disease Progression)

The evidence surrounding Cidophage in research exploring the progression to Type 2 Diabetes comes mainly from landmark Randomized Controlled Trials that included long-term follow-up phases. The primary focus was monitoring incidence to a formal Type 2 Diabetes diagnosis over a defined time interval, alongside measures such as Body Mass Index (BMI) and other markers related to metabolic stability.

What remains uncertain is the durability of these findings; follow-up data showed that the patterns observed changed after the administration of the study drug was concluded. Furthermore, the long-term impact on major clinical outcomes like heart disease in this prediabetes population are not fully established, and research is ongoing in this area.


Evidence for Use in Polycystic Ovary Syndrome (PCOS)

Studies exploring Cidophage in women with Polycystic Ovary Syndrome (PCOS) primarily consists of various Randomized Controlled Trials and subsequent Meta-analyses. The studies evaluated physiological markers (e.g., ovulation rate and menstrual cycle regularity) and metabolic markers (e.g., fasting insulin concentrations and blood lipid profiles).

A key research limitation is the lack of long-term outcomes regarding the prevention of future metabolic disease or cardiovascular issues in this patient population. There is also limited information due to the variability in diagnostic criteria for PCOS across the trials.

Key Studies & References

  1. 9. Pharmacologic Approaches to Glycemic Treatment: Standards of Care in Diabetes—2024 (American Diabetes Association)

Frequently Asked Questions (FAQ)

Common questions about Cidophage (FAQ)

Q: Is Cidophage similar to other common treatments for this condition?

A: According to official product information, Cidophage belongs to the Biguanide class of medication. This means it works by targeting specific mechanisms, such as decreasing glucose produced by the liver, which differentiates it from other drug classes used to manage blood sugar.


Q: Can Cidophage be used long-term?

A: Yes, the medication is commonly used for the chronic, long-term management of Type 2 Diabetes. However, the official labeling indicates that monitoring of Vitamin B12 levels and renal function (kidney function) is required or recommended during prolonged therapy.


Q: Are there specific foods or drinks that should be avoided with Cidophage?

A: Official warnings associate excessive alcohol intake, whether acute or chronic, with a significantly increased risk of the serious metabolic complication, lactic acidosis. There are no other specific food restrictions listed in the regulatory documents beyond alcohol.


Q: Is Cidophage safe for older adults (seniors)?

A: Official prescribing information advises caution due to the potential for reduced renal function (kidney function) that is more likely with increasing age. The labeling indicates that monitoring of renal function is recommended more frequently in older patients.


Q: Are there any studies comparing Cidophage to lifestyle changes?

A: The official indication for the drug states that it is intended for use as an adjunct to diet and exercise. This means it is designed to be used in addition to lifestyle changes to improve blood sugar control.


Q: Why do some patients stop taking Cidophage?

A: Clinical trials indicate the most common reasons patients discontinue the drug are related to gastrointestinal adverse reactions. These include very common side effects such as diarrhea, nausea, and vomiting.


Q: Does Cidophage require routine blood work?

A: Yes, regulatory guidelines indicate that renal function assessment is required prior to treatment and at least annually thereafter. Vitamin B12 levels should also be monitored periodically with long-term use.


Q: Are there different strengths of Cidophage available?

A: Yes, the immediate-release tablets are typically available in various strengths, including 500 mg, 850 mg, and 1000 mg tablets. The available strengths may vary based on the specific formulation being prescribed.


Q: Does Cidophage have a Black Box Warning from the FDA?

A: Yes, the official FDA label carries a Boxed Warning that highlights the risk of lactic acidosis. This is a rare but very serious buildup of lactic acid in the blood that requires urgent medical intervention.


Q: Can Cidophage be crushed or split?

A: Official guidance states that extended-release formulations must be swallowed whole and should never be crushed, cut, or chewed. Crushing these forms would compromise their time-release mechanism. The specific product's patient information details whether immediate-release tablets can be crushed or split.


Q: Why is Cidophage sometimes prescribed with another medication?

A: The drug may be prescribed alongside other medications, such as insulin or sulfonylureas, to provide an additive effect. This co-administration is intended to achieve improved and more comprehensive blood sugar control.


Q: How quickly should I expect Cidophage to start having an effect?

A: Studies on the drug’s physical processing in the body (pharmacokinetics) indicate that steady state plasma concentrations are typically reached within 24 to 48 hours under usual dosing schedules.


Q: How long does the effect of Cidophage last?

A: The drug is mainly eliminated unchanged by the kidneys. Official pharmacological data indicates that the plasma elimination half-life is approximately 6.2 hours.


Q: Is it normal to feel tired when starting Cidophage?

A: While unusual tiredness or weakness can be a general side effect, it is also listed in official warnings as a non-specific symptom associated with the rare but serious complication, lactic acidosis, which requires immediate medical attention.


Q: Does Cidophage interact with common pain relievers like ibuprofen?

A: Regulatory documents state that certain medications, including nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, may affect renal function. Since Cidophage is primarily eliminated by the kidneys, this potential effect can increase the risk of lactic acidosis.


Q: Can Cidophage be taken with vitamins or supplements?

A: The medication has been associated with a decrease in Vitamin B12 levels over time, and monitoring of B12 is often required. However, the official drug label does not advise against taking supplements in general.


Q: Is there any risk of addiction with Cidophage?

A: No, the medication is not classified by the DEA as a controlled substance. Official pharmacological data indicates it has no known risk of addiction or dependence.


Q: Does Cidophage affect blood pressure?

A: Official safety information notes that hypertension (high blood pressure) has been reported as an adverse event in some clinical trials. Conversely, hypotension (low blood pressure) is a known symptom associated with the serious complication, lactic acidosis.


Q: Can Cidophage cause weight gain or weight loss?

A: Clinical studies have shown that the medication is generally associated with modest weight loss or a weight-neutral status. This pattern differs from some other therapies used for diabetes management.


Q: Is Cidophage known to cause mood changes or anxiety?

A: When the drug is used in combination with an insulin secretagogue or insulin, the risk of hypoglycemia (low blood sugar) may increase. Symptoms of low blood sugar can include anxiety, confusion, and dizziness.


Q: Can Cidophage interact with common cold or flu medications?

A: The drug can interact with certain drug classes, such as drugs that can affect renal function or cause a rise in blood sugar (e.g., glucocorticoids). These types of drugs may be found in some cold or flu remedies.


Q: What should a patient do if they experience a severe side effect from Cidophage?

A: If a serious complication like lactic acidosis is suspected, the medication is typically immediately discontinued. Prompt supportive measures, including hemodialysis (a blood purification procedure), are recommended in a hospital setting.


Q: Is Cidophage safe to use during pregnancy? (Informational only)

A: Data is insufficient to inform a drug-associated risk for major birth defects or miscarriage. However, official guidance emphasizes that poorly controlled diabetes during pregnancy poses known risks to both the mother and the fetus.


Q: Is Cidophage safe to use while breastfeeding? (Informational only)

A: The drug is excreted into human milk in small amounts. Available limited data have not reported adverse effects in breastfed infants, but the decision to continue use while breastfeeding is made by the healthcare provider after balancing the drug's benefits and potential risks.


Q: Can Cidophage affect my sleep?

A: Official safety information indicates that somnolence (unusual sleepiness or drowsiness) is listed as one of the non-specific symptoms associated with the rare but serious complication, lactic acidosis.


Q: Does Cidophage affect fertility?

A: No evidence suggests the drug reduces fertility in men or women. Studies have shown it is sometimes prescribed for women with Polycystic Ovary Syndrome (PCOS) to improve ovulation.


Q: Does Cidophage contain lactose or gluten?

A: The official label lists the inactive ingredients, which typically include compounds like povidone and magnesium stearate. The specific product's label contains the definitive list of inactive ingredients, including any lactose or gluten.


Q: Does Cidophage affect driving or operating machinery?

A: The medication alone is not typically associated with low blood sugar. However, if used in combination with other diabetes drugs, the risk of hypoglycemia (low blood sugar) may increase, which can affect concentration and driving ability.


Q: How long does it take for Cidophage to be eliminated from the body?

A: Official pharmacological data indicates that the drug is eliminated via the kidneys. The plasma elimination half-life is approximately 6.2 hours, with about 90% of the absorbed drug eliminated within the first 24 hours.

How should Cidophage be stored and disposed of?

How to Store and Dispose of Cidophage

Cidophage (Metformin Hydrochloride) must be stored and handled according to specific official regulatory guidelines to maintain its stability and ensure safety.

Storage Requirements

Item Requirement
Temperature Store at Controlled Room Temperature, 20^circ to 25 C (68^circ to 77 F), avoiding extreme heat.
Protection Requires protection from light and moisture.
Container Keep in the tightly closed, original, light-resistant container.
Child Safety Keep out of the sight and reach of children at all times.

Disposal Instructions

Unused or expired Cidophage must be discarded in accordance with local requirements. The product must not be disposed of via wastewater or household refuse.

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

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