Ultracet

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Ultracet

Treatment option: Pain

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 Ultracet

Quick Facts

Property Description
Active ingredients Tramadol Hydrochloride and Acetaminophen
Form Tablet
Pharmacological Class Combination Analgesic
General Use Pain management (moderate to moderately severe)
Origin Synthetic

What Type of Medicine is Ultracet?

Ultracet is a fixed-dose combination (FDC) product classified as a Combination Analgesic, which is a synthetic and prescription-only medication administered as an oral tablet. This dual-component nature distinguishes it from single-agent pain relievers. Ultracet is clinically recognized for providing relief in situations where a less potent, non-opioid medication is insufficient, establishing its position in the hierarchy of pain management options. Its primary therapeutic purpose is the centralized management of moderate to moderately severe pain.

Composition: Tramadol Hydrochloride and Acetaminophen

The essential composition of Ultracet includes the two active ingredients: Tramadol Hydrochloride and Acetaminophen (Paracetamol). This specific pairing combines a synthetic opioid agonist with a widely utilized non-opioid analgesic to achieve efficacy. The inclusion of both components in a single tablet provides a balanced, dual-pathway approach to pain relief, leveraging the distinct chemical structures of both agents. The formulation of Tramadol/Acetaminophen is also marketed under various generic and brand names, such as Doreta and Tramacet.

General Principle of the Dual-Action Relief

The two active components create a synergistic effect, allowing Ultracet to execute a dual-action pain signaling blockade. The Tramadol component acts centrally by interacting with mu-opioid receptors and neurotransmitters, which alters the perception of pain, while the Acetaminophen component reduces the production of pain-signaling prostaglandins. Using such a dual-agent formulation is intended to maximize analgesic efficacy while potentially reducing the overall reliance on the opioid component alone. This central action is specifically suited for modulating moderate to moderately severe pain not controlled by single-ingredient therapies.

What side effects are possible with Ultracet?

Possible Side Effects and Safety Information

The official safety profile of Ultracet, a fixed-dose combination of Tramadol Hydrochloride and Acetaminophen, is defined by risks associated with both components, organized and communicated through frequency classifications established by regulatory authorities.

Frequency-Classified Adverse Reactions

Adverse reactions are grouped by the physiological system affected. Very Common reactions (affecting 1 in 10 or more) typically include Nausea, Dizziness, and Somnolence (drowsiness). Common reactions (affecting 1 to 10 in 100) often involve the gastrointestinal system, such as Constipation and Dry mouth, as well as the nervous system, including Headache and Anxiety.

System-Organ Class Examples of Common Adverse Reactions
Gastrointestinal Nausea, Constipation, Dry mouth
Nervous System Dizziness, Somnolence, Headache

Serious Safety Concerns and Restrictions

Regulatory documents highlight severe, clinically significant risks. These include the potential for Life-Threatening Respiratory Depression associated with the tramadol component and the risk of Severe Hepatotoxicity (liver damage) associated with the acetaminophen component, particularly if taken in high doses. Seizures and Serotonin Syndrome are also documented serious adverse reactions.

Safety constraints apply to specific populations. The product is contraindicated in severe hepatic impairment due to the risk of liver damage. It is also contraindicated in children younger than 12 years of age. Furthermore, effects like dizziness and somnolence are often more frequently observed at the start of treatment, while prolonged use carries the risk of physical and psychological dependence.

Overdose and Emergency Response

Overdose: When to Seek Help

Overdose with this medication combines the acute risks of both its tramadol (opioid) and acetaminophen components. This situation is potentially life-threatening and requires immediate medical intervention.

Immediate Action Required

If you believe that you or someone else may have taken an overdose of this medicine, get emergency medical help at once. Accidental ingestion of even one dose, particularly by a child, can result in a fatal overdose due to the tramadol component.

Documented Overdose Manifestations

Overdose symptoms are dual in nature, affecting the central nervous system, respiratory system, and liver:

System/Cause Manifestation as Documented in Official Labels
Tramadol Overdose Life-threatening respiratory depression, extreme sleepiness, seizures, circulatory collapse, miosis (pinpoint pupils), coma, and cardiac arrest.
Acetaminophen Overdose Early signs often include nausea, vomiting, anorexia, and malaise; these can progress to severe and potentially fatal hepatic (liver) necrosis.

Emergency Management and Antidotes

Specific actions are required to manage both toxicities. The opioid effects must be addressed immediately with an antagonist, such as naloxone, to reverse respiratory depression and other central nervous system effects. For the acetaminophen component, the timely administration of the antidote N-acetylcysteine (NAC) is necessary to minimize the risk of severe liver damage. Supportive care to maintain adequate ventilation and circulation is mandatory.

Therapeutic Uses of Ultracet

What Ultracet Treats: Main Uses and Benefits

The medication is generally used to provide supportive symptomatic relief for symptoms related to physical discomfort that have reached a moderate intensity or are moderately severe. This combination analgesic is considered relevant when supportive symptom management is appropriate, such as in situations where previous symptom management was not adequate or when additional symptomatic support is needed. It is applied when symptoms create noticeable interference with daily functioning, contributing to easing the overall symptom load.

The medication is commonly used during acute symptomatic episodes, such as short-term pain following an injury, or for relief in post-procedural contexts like after complex dental work or minor surgery. It also may assist with managing symptoms that become more disruptive during flare-ups associated with conditions such as osteoarthritis and certain forms of chronic low back pain. It helps address symptoms that create noticeable physiological strain, offering supportive relief, and may help patients cope more steadily with symptom fluctuations.

“The medication is applied in addressing moderate to moderately severe pain that may interfere with daily functioning.”

Quick Fact: Relief for Disruptive Discomfort

Indication Focus Symptom Intensity Patient Benefit
Acute Contexts Moderate to Moderately Severe Helps address symptoms that create noticeable physiological strain
Chronic Conditions Recurrent or Episodic May assist with maintaining functional stability and supports comfort

Regulatory References

  1. Official ULTRACET Label (via NIH DailyMed)

Eligibility and Restrictions for Use

Ultracet's eligibility for use is strictly defined by government regulatory documentation, focusing on absolute contraindications and population-specific restrictions. The medicine is primarily intended for adults and adolescents 12 years and older whose pain requires this specific combination.

Absolute Contraindications

Ultracet must not be used by patients who have a known hypersensitivity to its active ingredients or other opioids. It is strictly contraindicated in individuals with severe hepatic impairment, those with significant respiratory depression, or patients with a known gastrointestinal obstruction. Use is also prohibited for patients taking Monoamine Oxidase Inhibitors (MAOIs) or within 14 days of their withdrawal, or those in a state of acute intoxication with alcohol or psychotropic medicines.

Age and Condition Restrictions

Regulatory labeling dictates that the medicine is contraindicated in all children younger than 12 years of age, and in adolescents under 18 following tonsillectomy or adenoidectomy. The medicine is not recommended for women who are pregnant or breastfeeding, as prolonged use during pregnancy may result in neonatal opioid withdrawal syndrome. Patients with severe renal impairment or a history of epilepsy or seizure risk are subject to restricted or conditional use, as specified in the official labeling.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Ultracet, a combination analgesic, has officially documented interaction patterns primarily involving pharmacodynamic effects and metabolic pathways. All information presented is based strictly on government regulatory documents.

Contraindicated Combinations

The co-administration of Monoamine Oxidase Inhibitors (MAOIs), or use within 14 days of their discontinuation, is strictly contraindicated due to the high risk of Serotonin Syndrome and seizures. Co-administration with any other medicinal product containing Tramadol or Acetaminophen is also contraindicated to prevent overdose and associated toxicities.

Documented Pharmacodynamic and Metabolic Interactions

Concomitant use with Central Nervous System (CNS) Depressants (including alcohol) carries a significant risk of profound sedation and respiratory depression. Similarly, combining with other Serotonergic drugs may increase the risk of both Serotonin Syndrome and seizures. The metabolism of the Tramadol component is officially mediated by CYP2D6 and CYP3A4 enzymes; therefore, co-administration with inhibitors or inducers of these enzymes may alter the plasma concentrations of Tramadol and its active metabolite, requiring careful regulatory consideration. Additionally, co-administration with warfarin-like compounds requires periodic evaluation of Prothrombin Time/INR due to reports of altered coagulation markers related to the Acetaminophen component. The medication is also contraindicated in severe hepatic impairment due to the Acetaminophen component.

Mechanism of Action

Ultracet is a fixed-dose combination product containing tramadol hydrochloride and acetaminophen, which modulate distinct pathways to affect signal transmission. Tramadol acts through two primary mechanisms. First, it functions as a non-selective, weak agonist of the mu-opioid receptor (mu-OR), a G-protein coupled receptor. mu-OR binding inhibits adenylyl cyclase activity, leading to ion channel conductance changes and altered presynaptic neurotransmitter release. Second, tramadol inhibits the neuronal reuptake of both norepinephrine (NE) and serotonin (5-HT) in the central descending inhibitory pathways. Acetaminophen exerts its effects primarily through central inhibition of cyclooxygenase (COX) enzymes, particularly COX-2. This inhibition disrupts the production of prostaglandins from arachidonic acid within the central nervous system. The convergent effects of these two agents modulate central nociceptive processing.

Dosage and Administration Information

Official Administration Guidelines

Ultracet is a fixed-dose combination product containing tramadol and acetaminophen that is intended for oral administration as an immediate-release tablet. The medication is indicated for short-term use, restricted to a maximum duration of five days or less.


Dosage and Schedule

Administration is structured on an as-needed (PRN) basis. The standard initial adult dose is two tablets.

Additional doses may be taken every four to six hours as needed for pain relief, provided the interval between doses is not less than six hours. The total consumption must not exceed 8 tablets (equivalent to 300 mg of tramadol and 2,600 mg of acetaminophen) in any 24-hour period.

Tablets must be swallowed whole with liquid and should not be broken, crushed, or chewed. They may be taken independently of meals.


Population-Specific Constraints

Specific dosage modifications are required for certain populations to prevent potential accumulation of the components:

  • Severe Renal Impairment (Creatinine Clearance <30 mL/min): The dose must not exceed two tablets every 12 hours.
  • Severe Hepatic Impairment: The medication should not be administered.
  • Pediatric Use: The safe and effective use of Ultracet has not been established in children under 12 years of age, and its use is prohibited in this population.
  • Discontinuation: If physical dependence is possible following use, the drug requires a gradual downward taper and must not be stopped abruptly.

Due to the combination of active ingredients, Ultracet must not be co-administered with any other products containing tramadol or acetaminophen to avoid exceeding maximum daily limits.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Ultracet

The clinical evaluation of the Tramadol/Acetaminophen combination focused on the study of pain symptoms in both acute and chronic clinical settings. The findings are based primarily on Randomized Controlled Trials (RCTs) and systematic reviews, which contribute to understanding symptom patterns observed in defined study groups and what aspects of how symptoms change remain outside the scope of current research.


Evidence for Use in Acute Pain Management

The research for acute, moderate to moderately severe pain relied heavily on short-term, placebo-controlled trials and subsequent meta-analyses. These studies focused on adult patients with pain following procedures, such as dental surgery, or during acute episodes, such as migraine headaches. Researchers monitored how symptoms changed over time by measuring pain intensity on standardized scales and examining the onset and duration of measured changes in discomfort.

Research contributes to the broader evidence landscape, focusing on short-term changes measured in outcomes related to physical discomfort during periods of increased symptom activity. However, the evidence is limited, as the research is primarily constrained to single-dose or very short-course usage in controlled settings.


Evidence for Use in Chronic Pain Conditions

The research base for chronic, moderate to moderately severe pain, such as that related to osteoarthritis (OA) and chronic low back pain (LBP), stems from intermediate-term Randomized Controlled Trials (RCTs) and large systematic reviews. These studies explored patients who were experiencing conditions marked by functional limitations and where symptoms may vary in intensity.

Studies evaluated outcomes related to physical discomfort and outcomes reflecting daily functioning or activity level. Findings describe group patterns related to how patients reported their experience and how outcomes reflecting daily functioning or activity level were measured in the observed populations.


Gaps and Uncertainty in the Research Record

A primary limitation is the lack of long-term data for chronic use, as controlled trials were not designed to monitor outcomes beyond the 12-week mark. Regulatory documentation explicitly states that the combination has not been systematically evaluated beyond 12 weeks in controlled settings. Furthermore, data for certain groups remain insufficient, including populations such as children or pregnant populations, as these groups are often excluded from initial controlled trials. Research does not determine whether an individual will respond similarly.

Key Studies & References

  1. Official ULTRACET Label (Tramadol and Acetaminophen) - Product Labeling via NIH DailyMed

Frequently Asked Questions (FAQ)

Common questions about Ultracet (FAQ)

Q: What is Ultracet used for?

A: Ultracet is approved for the short-term (five days or less) management of acute pain that is severe enough to require an opioid treatment and for which alternative treatments are inadequate. It is a combination medication containing tramadol (an opioid) and acetaminophen (a non-opioid pain reliever).

Q: Is Ultracet a controlled substance?

A: Yes, tramadol, one of the active ingredients in Ultracet, is classified as a Schedule IV controlled substance due to its potential for abuse, dependence, and misuse. The combination product, Ultracet, is therefore also subject to controlled substance regulations.

Q: How should I stop taking Ultracet?

A: Discontinuing any medication, especially one containing an opioid, should be done under the guidance of a healthcare professional. Suddenly stopping treatment may lead to withdrawal symptoms in individuals who have developed physical dependence. A doctor may recommend a gradual reduction in dosage to minimize these effects.

Q: Can I take other pain relievers with Ultracet?

A: It is important to check with a healthcare provider or pharmacist before taking any other pain relievers. Ultracet already contains acetaminophen, and taking additional products that also contain acetaminophen could lead to an accidental overdose and liver damage.

Q: What are the most common side effects of Ultracet?

A: The drug’s label indicates that common side effects may include dizziness, somnolence (drowsiness), nausea, vomiting, constipation, and headache. It is advisable to discuss the potential risks and benefits with a prescribing healthcare professional.

How should Ultracet be stored and disposed of?

Official Storage and Handling

ULTRACET tablets must be stored at controlled room temperature, specifically between 20 C and 25 C (68 F and 77 F), with temporary excursions permitted from 15 C to 30 C [1.2]. Storage environments must avoid excess heat and moisture and protect the tablets from freezing or direct light [1.3]. The medication should remain in its original container and be kept tightly closed [1.3].

Child-Safety Storage

Due to the presence of an opioid component, it is mandatory to store the product out of the sight and reach of children and in a safe, secure place to prevent accidental ingestion or misuse [1.3].

Disposal Requirements

Expired or unused ULTRACET must be promptly disposed of [1.4]. The preferred method is using an authorized Drug Take-Back Program or DEA-registered collector [2.7]. If a take-back option is unavailable, disposal can occur in the household trash by removing the tablets from their container, mixing them with an undesirable substance like used coffee grounds or dirt, and placing the mixture in a sealed bag [2.3]. The product is not on the FDA's flush list [2.7].

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

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