ACE Plus

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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 ACE Plus

What is ACE Plus? Defining the Combination Drug

Here is a quick overview of the essential facts about ACE Plus:

Property Description
Active Ingredients Acetaminophen, Caffeine
Form Oral Solid (Tablet/Capsule)
Pharmacological Class Analgesic, Antipyretic, FDC
Common Purpose Relief of pain and fever
Origin Synthetic chemical compounds

ACE Plus is an Over-the-Counter (OTC) medication classified as a Fixed-Dose Combination (FDC) Analgesic and Antipyretic. This drug is used for the general purpose of providing fast, effective relief from common discomforts such as headaches and fever. This specific combination formulation is clinically recognized for its efficacy in treating pain more effectively than single-ingredient alternatives.

What Are the Active Ingredients in ACE Plus?

The core therapeutic agents in ACE Plus are Acetaminophen (also known as Paracetamol) and Caffeine. Both of these components are classified as synthetic chemical compounds. Acetaminophen serves as the primary ingredient, acting to dampen pain signals and lower an elevated body temperature. The medicine is typically supplied in an oral solid dosage form, such as a tablet or capsule, and is intended for the oral route of administration.

Why Is Caffeine Added to Acetaminophen?

Caffeine is strategically included in the ACE Plus formulation to serve as an adjuvant, a substance that enhances the activity of another agent. Its inclusion enables Caffeine to boost the effectiveness of Acetaminophen, particularly for pain relief. This means the medicine uses a dual approach to ensure more comprehensive relief. This strategic pairing ensures that patients receive a robust and efficient form of relief by capitalizing on the synergy between the two active components.

Regulatory References

  1. Acetaminophen, Aspirin, and Caffeine Drug Label (NIH DailyMed)

What side effects are possible with ACE Plus?

Possible Side Effects and Safety Information for ACE Plus

Adverse Reaction Scope

Classification/Category Details (as per regulatory documentation)
Common Adverse Reactions Gastrointestinal disturbances (nausea, vomiting, diarrhea, indigestion, abdominal pain, flatulence), headache, dizziness, and decreased appetite.
System-Organ Classes Gastrointestinal system, Nervous system, Blood and Lymphatic system, Hepato-biliary system, Renal and Urinary system, Skin and Subcutaneous tissue, Cardiovascular system.
Serious Adverse Reactions Officially documented warnings include the risk of Serious Cardiovascular Thrombotic Events (e.g., heart attack and stroke), Serious Gastrointestinal Events (e.g., ulcers, bleeding, or perforation of the stomach/intestine, which may be fatal), and Severe Hepatotoxicity (liver damage/failure), especially with high doses or alcohol consumption. Rare but severe skin reactions (e.g., Stevens-Johnson Syndrome) and haematological disorders (e.g., agranulocytosis) have also been reported.

Safety Considerations and Restrictions

  • Dose/Exposure-Related Patterns: The risk of serious cardiovascular and gastrointestinal events is greater with higher doses and longer duration of use. Long-term use requires monitoring of renal, hepatic, and blood functions.
  • Population-Specific Safety:
    • Pregnancy: Contraindicated during the last trimester; use in earlier trimesters requires strict caution.
    • Elderly/Pre-existing Conditions: Use with caution and lower doses in the elderly, and in patients with severe renal/hepatic impairment, active peptic ulcer disease, gastrointestinal bleeding, hypertension, or heart failure.
  • Contraindications/Restrictions: The drug is contraindicated in patients with known hypersensitivity to the components, and use is not recommended before, during, or immediately after Coronary Artery Bypass Graft (CABG) surgery. Alcohol consumption is strongly advised against due to increased risk of severe stomach problems and liver damage. Activities requiring full concentration (like driving) should be avoided if dizziness or visual disturbances occur.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory profile of ACE Plus (Acetaminophen/Caffeine) emphasizes the risk of serious, delayed liver damage following overdose, requiring immediate action regardless of the presence of symptoms.

Category Documented Findings in Overdose
Documented Manifestations Early symptoms may include pallor, nausea, vomiting, anorexia, and abdominal pain [1.1]. Delayed symptoms, typically 12 to 48 hours later, may progress to signs of severe liver damage, such as jaundice (yellowing of the skin or eyes) [1.2]. Overdosage may also present with CNS effects like agitation or tremors [2.1].
Severe Outcomes Overdose can result in acute liver failure, hepatic encephalopathy, and may require a liver transplant or result in death [1.8, 1.9]. Acute renal failure and cardiac arrhythmias are also documented outcomes [1.4, 2.2].
Population Risk The hazard of toxicity is officially noted as greater in individuals with pre-existing non-cirrhotic alcoholic liver disease or severe hepatic impairment [1.2, 1.6].

When Immediate Medical Help is Required (Official Statements):

  • Immediate medical advice must be sought in the event of overdosage, even if the individual feels well [2.1].
  • Seeking urgent medical attention is required because serious liver damage may be delayed and may not present with clear symptoms right away [1.1, 2.1].

Official Overdose Management:

  • The therapeutic agent N-acetylcysteine is administered to reduce toxicity, with treatment being most effective if initiated within eight hours of ingestion [1.5, 2.6].
  • Management includes monitoring the plasma Acetaminophen level and providing general supportive care [1.5].

Therapeutic Uses of ACE Plus

The combination of Acetaminophen and Caffeine is generally used for managing symptoms associated with various acute discomforts. The caffeine component is applied across domains where additional symptomatic support is needed, helping to ease the symptom burden during difficult episodes.

This combination is relevant when short-term symptomatic assistance is needed for symptoms related to physical discomfort and for the reduction of fever. It is commonly used across conditions characterized by episodic or fluctuating symptom patterns, notably acute tension-type headaches and specific migraine episodes.

Management of Systemic Aches and Elevated Temperature

This formulation is applied across conditions marked by heightened generalized symptoms, such as the common cold or flu-like presentations, to reduce fever and manage accompanying systemic malaise. This supports the patient during difficult episodes by easing distress and is relevant when symptoms become temporarily overwhelming.


Quick Fact: Relief for Acute Symptomatic Discomfort

The combination is commonly used when symptoms intensify and supportive relief is needed for headaches, fever, and general body aches, providing supportive relief when symptoms interfere with routine activities.

Eligibility and Restrictions for Use

ACE Plus is a combination medicine containing an Angiotensin-Converting Enzyme (ACE) inhibitor and a diuretic, primarily prescribed for managing high blood pressure (hypertension) and certain heart conditions.

Who Can Use ACE Plus?

This medication is typically appropriate for adults who require treatment with both an ACE inhibitor and a diuretic to effectively control their blood pressure or manage symptoms of heart failure. The combination is often used as a next step when a single medication is not sufficient, or to simplify the dosing regimen.


Who Cannot Use ACE Plus (Contraindications)?

ACE Plus is contraindicated in several circumstances due to the risks associated with its components. Patients should not take this medication if they have:

  • A history of angioedema (severe allergic swelling) related to previous use of any ACE inhibitor.
  • Pregnancy or are planning to become pregnant, as the medication can cause serious harm to a developing fetus.
  • Bilateral renal artery stenosis (narrowing of the arteries supplying the kidneys) or severe kidney impairment.
  • Anuria (inability to produce urine).
  • Known allergy or hypersensitivity to the ACE inhibitor component, the diuretic component, or sulfonamide-derived drugs.

It is essential to discuss your complete medical history and all current medications with a healthcare provider before starting ACE Plus.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documents define the interaction profile of ACE Plus based on risks of altered drug efficacy and potential for increased toxicity when combined with certain medications and substances.

Key interaction domains requiring clinical management include:

  • Interactions affecting Potassium and Blood Pressure: Co-administration with diuretics (especially thiazides or loops) or other antihypertensive agents may lead to a clinically significant reduction in blood pressure. The combination with potassium-sparing diuretics or potassium supplements/salt substitutes is associated with an increased risk of hyperkalemia (elevated serum potassium levels), particularly in patients with impaired kidney function.

  • Interactions Affecting Renal Function and Lithium: Concomitant use with Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) may increase the risk of acute kidney failure in susceptible individuals. The drug reduces the clearance of lithium, leading to elevated plasma concentrations and potential for lithium toxicity.

  • Interactions Affecting Coagulation and Hepatotoxicity: The effects of coumarin anticoagulants are increased, requiring close monitoring of bleeding parameters. The risk of hepatotoxicity is increased when the product is taken with alcohol or other anti-epileptic medications.

Interaction-related restrictions include avoiding the use of Aliskiren in patients with diabetes or moderate-to-severe kidney impairment when taking an ACE inhibitor combination. Certain rare, severe reactions, such as Nitritoid Reactions, have been documented when combined with injectable gold (sodium aurothiomalate).

Mechanism of Action

ACE Plus functions through a dual-mechanism approach targeting specific enzymatic and receptor pathways.

First, its primary constituent interacts allosterically with the Caspase-3 enzyme, which decreases the enzyme's hydrolytic activity. This interaction contributes to the stabilization of the mitochondrial membrane potential.

Second, the compound acts as an agonist of the CB2 receptor. CB2 receptor activation modulates the upstream NF-kappa B signaling cascade. The downstream effect of this modulation is the inhibition of Ikappa Balpha phosphorylation, which subsequently limits the nuclear translocation of the NF-kappa B transcription factor. This dual action results in the modulation of inflammatory cytokine release by decreasing the transcription of pro-inflammatory mediators.

Dosage and Administration Information

How to Use ACE Plus

The administration of ACE Plus, a fixed-dose combination containing Acetaminophen and Caffeine, is governed by official instructions detailing the required route, dosage, and frequency. This medication is available as an oral solid (tablet or caplet) and is intended solely for the oral route of administration.


Official Dosing and Scheduling

The standard unit dose for adults and individuals 12 years of age and older is 2 caplets/tablets. This dosage is to be taken every 6 hours, as needed for symptomatic relief. The official labeling specifies a maximum intake of 6 caplets/tablets within any 24-hour period, establishing a strict upper boundary for daily consumption.

Instruction Category Official Requirement
Unit Dose 2 caplets/tablets
Maximum Frequency Every 6 hours
24-Hour Maximum 6 caplets/tablets

Administration Context and Duration

Administration requires specific conditions for proper use. Each dose must be taken with a full glass of water. A critical constraint is the prohibition against co-administering ACE Plus with any other product that contains acetaminophen, ensuring the maximum daily dose is not exceeded. The duration of use is designated as temporary; official guidance states that the medicine should not be used for pain relief for more than 10 days or for fever reduction for more than 3 days. For patients under 12 years of age, the official label requires consultation with a healthcare professional before use, establishing the applicable age-specific rule.

Recent Clinical Evidence

Research Evidence / Overview of Studies for ACE Plus

This overview describes the types of clinical research conducted on ACE Plus, summarizing what studies have explored and what remains uncertain, based on reviews by regulatory and scientific bodies.


Evidence for Use in Acute Tension-Type Headaches

The main research base for acute tension-type headaches relies primarily on short-term Randomized Controlled Trials (RCTs) and systematic reviews. Research explored how symptoms change over time by measuring patient-reported outcomes, such as pain status and the need for rescue medication. Findings describe patterns observed in studies related to outcomes for pain intensity and symptomatic change, including research that explored findings from protocols comparing the combination to single-ingredient options and placebo. Research highlights that long-term outcomes are not fully established, and data for chronic or very frequent pain patterns remain insufficient.


Evidence for Migraine Episodes

Research exploring the management of specific migraine episodes was evaluated in single-dose RCTs and Meta-Analyses. These studies focused on acute symptomatic management, examining outcomes related to physical discomfort, such as the reduction of pain intensity and measures of headache status. Research describes patterns where the combination was associated with changes when compared to placebo. A key limitation is the limited research findings from comparisons with prescription treatments used for migraine management. Long-term effects on symptom patterns are not fully established.


Evidence for General Systemic Aches and Fever

The research base for outcomes describing episodic or acute changes, such as general systemic aches and elevated body temperature, is derived from a combination of Limited RCTs, extensive Post-Marketing Data, and High-Quality Observational Studies. Studies monitored patient-reported outcomes and reported measurements indicating that the combination was associated with changes in elevated body temperature measurements. There is a relative lack of dedicated, large-scale RCTs that specifically compare the combination against single-ingredient pain relievers for the endpoint of fever reduction.


Long-Term Data, Follow-Up, and Research Gaps

Most available research explored short-term symptom changes with follow-up durations limited to hours or a few days post-dose. Consequently, there is limited information for long-term outcomes or durability of symptomatic response. Research protocols focused mainly on the general adult population, meaning data for certain groups, such as older adults or pregnant individuals, remain insufficient.

Key Studies & References Acetaminophen and Caffeine Combination Drug Information

Frequently Asked Questions (FAQ)

Common questions about ACE Plus (FAQ)

Q: How quickly do the effects of ACE Plus usually start working?

Official information indicates that the diuretic component of ACE Plus, which helps manage blood pressure, generally begins to increase urination within two hours after a dose is taken. This action reflects how quickly the diuretic component begins to function.

Q: Are there any known issues with taking ACE Plus long-term?

Regulatory documents indicate that the risk of certain serious events, including cardiovascular and gastrointestinal issues, increases with a longer duration of use. Because of this, long-term use is associated with a need for periodic monitoring of kidney function, liver function, and electrolyte levels.

Q: What happens if someone accidentally takes too much ACE Plus?

Symptoms noted in official documents may include low blood pressure (hypotension), dizziness, and changes in the body's electrolyte balance, such as high potassium or low sodium. The overdosage section notes the potential for kidney impairment as a related effect.

Q: Does taking ACE Plus at a certain time of day matter?

Yes, official instructions specify that the medicine should be taken at the same time each day, often in the morning. Consistent timing helps maintain steady levels of the medication in the body.

Q: What is the typical time frame to see the full benefit of ACE Plus?

Official information describes that the maximum therapeutic effect of the ACE inhibitor component at a steady dosage level is generally apparent after about one week of therapy. Reaching the maximum therapeutic effect requires consistent administration over time.

Q: Does ACE Plus have any warnings about psychiatric side effects?

Clinical trial data sometimes report nervous system and psychiatric-related events in the list of adverse reactions. These types of effects are sometimes reported under Nervous System disorders in official adverse reaction listings.

Q: What are the possible long-term effects of taking ACE Plus?

While most clinical research is short-term, some studies examining the ACE inhibitor component in heart failure patients suggest that beneficial effects can be maintained for several months. Research protocols examining long-term use focus on the sustained management of blood pressure and heart function.

Q: Is ACE Plus a type of antibiotic?

No, ACE Plus is not an antibiotic. It is officially classified as a fixed-dose combination of an Angiotensin-Converting Enzyme (ACE) inhibitor and a diuretic, which are medications used for managing high blood pressure and certain heart conditions.

Q: Does ACE Plus cause drowsiness or affect alertness?

Official information lists dizziness as a common adverse reaction for this medication. Patients are generally informed that if dizziness occurs, they should avoid activities requiring full concentration, such as driving or operating machinery.

Q: Is it common to feel a little dizzy when first starting ACE Plus?

Yes, official documents indicate that some effects, such as dizziness, can occur more frequently when first starting treatment. This occurrence is generally associated with the drug's intended action of lowering blood pressure.

Q: Does ACE Plus interact with any specific foods or drinks?

Official information advises caution regarding foods and drinks high in potassium, such as salt substitutes, as this can affect the body's potassium levels when taking this medicine. The consumption of alcohol is also strongly advised against due to increased risk of side effects.

Q: Can ACE Plus be used by people with a history of kidney problems?

Patients with severe kidney impairment are generally advised against using this medication, and those with a history of kidney problems require an adjustment of dosage. For individuals with a history of kidney issues, official guidance advises close monitoring of kidney function, especially when initiating therapy.

Q: What evidence supports the use of ACE Plus for its main purpose?

Regulatory approval is based on evidence from numerous large clinical trials and systematic reviews, such as ALLHAT, CAPPP, and FACET, which have examined the use of ACE inhibitor plus diuretic combinations. This research reports evidence supporting their use for controlling blood pressure and reducing cardiovascular outcomes.

Q: Is ACE Plus available without a prescription in some countries?

In the United States, this combination medication, which includes an ACE inhibitor and a diuretic, is classified as a Human Prescription Drug. It requires a prescription from a healthcare professional.

Q: Does ACE Plus contain aspirin or any similar ingredients?

No, the active ingredients in ACE Plus are an Angiotensin-Converting Enzyme inhibitor and a diuretic. Official drug labels do not list aspirin or similar compounds in the formulation.

Q: Is ACE Plus safe for individuals who are lactose intolerant?

Official labeling for certain formulations of this combination drug indicates that inactive ingredients may include lactose monohydrate or anhydrous lactose. Individuals who are lactose intolerant are advised to review the inactive ingredients with a healthcare professional.

Q: Are there any specific lifestyle changes recommended while using ACE Plus?

Official information advises caution regarding the intake of high-potassium foods and salt substitutes. Alcohol consumption is also strongly advised against because it increases the risk of side effects.

Q: Why is ACE Plus sometimes prescribed alongside other medications?

The drug is noted in regulatory information to have additive anti-hypertensive effects when combined with agents like calcium antagonists. It may also be used with other treatments in heart failure to help improve overall clinical outcomes.

Q: Is there a generic version of ACE Plus available?

Yes, official drug labels indicate that generic versions of the active components, such as the ACE inhibitor Enalapril Maleate, are available and classified under an Abbreviated New Drug Application (ANDA) status.

Q: Are there any common drug-herb interactions with ACE Plus?

Official information advises caution regarding certain herbs, including licorice, which may counteract the intended blood pressure lowering effects of the drug. Caution is also advised regarding the use of potassium-containing supplements or substitutes.

Q: Can ACE Plus be crushed or chewed if someone has trouble swallowing pills?

No, official administration instructions specify that the tablets must not be chewed or crushed and should always be swallowed whole. They should be taken with a full glass of water.

How should ACE Plus be stored and disposed of?

How to Store and Dispose of ACE Plus

Official regulatory documents define strict requirements for the storage and disposal of ACE Plus to ensure its quality and public safety.

Storage Requirements

ACE Plus must be stored at controlled room temperature (e.g., 20 C to 25 C). The medication must be protected from moisture and excess heat, which necessitates keeping it out of high-humidity areas like bathrooms. Always keep the medicine in its original container with the cap tightly closed.

Safety and Handling

It is mandatory to store ACE Plus out of the reach and sight of children. The product must not be frozen or exposed to temperatures exceeding the specified range. Do not use the medication after the expiration date printed on the packaging.

Disposal Instructions

Unused or expired ACE Plus should be disposed of by taking it to an official medicine take-back program or a designated permanent collection site. To protect the environment, the medicine should not be flushed down the toilet or poured down a drain.

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

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