Can Dextromethorphan Make You High? | Understanding DXM

Many of us reach for over-the-counter cough and cold medicines without much thought, trusting them to relieve our symptoms. One ingredient, dextromethorphan or DXM, is a staple in many of these remedies. It’s important to understand what DXM does, both at its intended dose and when misused, as its effects can shift dramatically.

What Exactly is Dextromethorphan (DXM)?

Dextromethorphan is a medication primarily used as a cough suppressant. It works by affecting a specific area in the brain called the medulla, which controls the cough reflex. At standard therapeutic doses, DXM helps calm persistent coughing by increasing the cough threshold, meaning it takes a stronger stimulus to trigger a cough.

Chemically, DXM is an opioid derivative, but it does not typically produce opioid-like effects such as pain relief or significant respiratory depression at recommended doses. Its primary action as a cough suppressant is through its activity as a sigma-1 receptor agonist.

How DXM’s Effects Shift at Higher Doses

The story of DXM changes significantly when it’s consumed in quantities far exceeding the recommended dose. At these elevated levels, DXM’s mechanism of action expands beyond just suppressing coughs. It begins to interact with other brain receptors, leading to profoundly different effects.

When taken in large amounts, DXM acts as an N-methyl-D-aspartate (NMDA) receptor antagonist. This is the same class of drug as ketamine and phencyclidine (PCP), known for their dissociative properties. This interaction can disrupt normal brain communication, leading to altered perceptions of reality, body, and self.

DXM also has some activity as a serotonin reuptake inhibitor, which can contribute to mood elevation or, in dangerous combinations, lead to serotonin syndrome. Additionally, it can weakly affect opioid receptors, though this is less prominent than its NMDA antagonism at abuse doses.

The “Plateaus” of DXM Intoxication

The effects of DXM misuse are often described in terms of “plateaus,” which correspond to increasing dose levels and distinct experiences. These plateaus are not precise medical definitions but are commonly used to categorize the varying degrees of intoxication.

• First Plateau (100-200 mg): This level can produce mild stimulation, a slight alteration in perception, and a feeling of mild euphoria. Some describe it as similar to being mildly intoxicated by alcohol.
• Second Plateau (200-400 mg): Effects become more pronounced, including stronger euphoria, visual and auditory hallucinations, impaired motor coordination, and a noticeable change in thought processes. Speech may become slurred, and movements can be clumsy.
• Third Plateau (400-700 mg): At this dose, individuals often experience significant dissociation, feeling detached from their body and surroundings. Vivid hallucinations, out-of-body experiences, and a profound alteration of reality are common. Motor control is severely compromised, making movement difficult or impossible.
• Fourth Plateau (700 mg and above): This is an extremely dangerous dose level. It can lead to complete dissociation, a near-total loss of motor control, and a state resembling a trance. There is a high risk of overdose, respiratory depression, seizures, and coma.

The Risks of DXM Abuse

Misusing DXM carries substantial risks, affecting both the body and the mind. The dangers extend beyond the immediate intoxicating effects, with potential for severe health complications and lasting harm.

Physical Dangers

High doses of DXM can overwhelm the body’s systems. Acute physical risks include nausea, vomiting, dizziness, and rapid, involuntary eye movements (nystagmus). More severe reactions can involve a dangerously rapid heart rate, elevated blood pressure, and hyperthermia (overheating).

A serious concern is the risk of respiratory depression, where breathing becomes dangerously slow or shallow, potentially leading to oxygen deprivation. Seizures and coma are also possible at very high doses. Combining DXM with other substances, especially alcohol or other central nervous system depressants, significantly amplifies these dangers.

Another critical risk is Serotonin Syndrome, which can occur when DXM is taken with other medications that increase serotonin levels, such as certain antidepressants. Symptoms include agitation, confusion, rapid heart rate, high blood pressure, dilated pupils, muscle rigidity, and fever. This condition can be life-threatening.

Mental and Cognitive Risks

The dissociative effects of DXM can be distressing and disorienting. Individuals may experience intense paranoia, panic attacks, or even acute psychosis, characterized by delusions and a complete loss of touch with reality. These episodes can be frightening and may require emergency medical intervention.

Repeated abuse of DXM can lead to persistent memory problems, difficulties with concentration, and other cognitive impairments. There is also a clear risk of developing a substance use disorder, where the individual becomes dependent on DXM to function or feel normal.

Recognizing DXM Abuse

Identifying DXM abuse can be challenging, as the substance is readily available. However, certain behavioral and physical indicators can signal misuse. Observing these signs can be crucial for early intervention.

Behavioral changes often include secretiveness, withdrawal from usual activities, changes in friends, or a decline in school or work performance. Individuals may spend unusual amounts of money on cough medicines or exhibit secretive behavior around their use.

Physical signs can be more direct. These include dilated pupils, slurred speech, a characteristic “robot walk” due to impaired motor coordination, and an uncharacteristic lack of responsiveness or disorientation. Empty cough syrup bottles or blister packs from pills containing DXM may be found.

The Dangers of “Coricidin Cold & Cough” and Other Combination Products

Many cold and cough medicines contain DXM alongside other active ingredients. Products like “Coricidin HBP Cough & Cold” (often referred to as “Triple C’s” in abuse contexts) are particularly dangerous when misused because they contain not only DXM but also other medications like acetaminophen or antihistamines.

When someone takes large doses of these combination products to achieve a DXM high, they are also ingesting dangerously high amounts of the other ingredients. Acetaminophen, for example, can cause severe, irreversible liver damage and liver failure at doses only slightly above therapeutic levels. The liver can only process a limited amount of acetaminophen at a time.

Antihistamines, such as chlorpheniramine maleate found in some formulations, can cause excessive sedation, hallucinations, seizures, and serious cardiac problems when taken in overdose. Decongestants, like pseudoephedrine or phenylephrine, can lead to dangerously high blood pressure, heart palpitations, and anxiety. The presence of these additional ingredients significantly increases the risk of severe adverse effects, making combination product abuse far more hazardous than DXM alone.

Understanding these compounded risks is vital because many individuals misusing DXM may not be aware of the specific dangers posed by the other ingredients in the products they consume. For more information on substance misuse and its effects, resources are available from organizations like the National Institute on Drug Abuse.

Long-Term Consequences and Dependence

Chronic DXM abuse can lead to a range of long-term health issues and the development of dependence. The brain adapts to the regular presence of DXM, leading to tolerance, where higher and higher doses are needed to achieve the same effects.

Stopping DXM after prolonged abuse can trigger withdrawal symptoms, which indicate physical or psychological dependence. These symptoms can include restlessness, cravings for the substance, bone and muscle aches, insomnia, and intense mood disturbances. Managing withdrawal often requires medical attention and support.

Beyond dependence, long-term abuse can result in persistent cognitive deficits, including problems with memory and learning. There is also concern about the lasting impact on brain development, especially in adolescents whose brains are still maturing. The dissociative experiences themselves can be traumatizing, potentially leading to ongoing anxiety or dissociative disorders.

The Substance Abuse and Mental Health Services Administration (SAMHSA) offers additional resources on substance use and its long-term effects.

Legal Status and Prevention Efforts

Dextromethorphan is an over-the-counter medication, meaning it can be purchased without a prescription. However, due to its abuse potential, many states and localities have implemented age restrictions, requiring purchasers to be 18 years or older to buy products containing DXM.

These regulations aim to limit access, particularly for adolescents who are at higher risk for experimentation and abuse. Some retailers also place DXM-containing products behind the counter to require interaction with staff, further deterring underage or illicit purchases.

Public awareness campaigns also serve a vital role in prevention. These efforts educate individuals about the dangers of DXM abuse, the specific risks of combination products, and the signs of misuse. The goal is to promote responsible use of medications and to highlight the serious health consequences that can arise from intentional misuse.

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