Xanax (alprazolam) most commonly causes drowsiness, lightheadedness, and problems with coordination. These effects stem from how the drug works: it amplifies the activity of a calming brain chemical called GABA, which slows down nerve signaling throughout your central nervous system. That slowing produces the anti-anxiety effect you’re after, but it also affects movement, memory, speech, and alertness in ways that range from mildly annoying to genuinely dangerous.
Common Side Effects
The side effects most people notice are extensions of the drug’s sedative action. Drowsiness and sleepiness top the list, often accompanied by lightheadedness, difficulty concentrating, and feeling unusually tired or weak. Many people also report coordination problems: unsteady walking, clumsiness, shakiness, and trouble performing routine physical tasks. These motor effects are not just inconvenient. They raise real injury risk, especially when driving or operating equipment.
Xanax can also affect speech and mood. Slurred speech, changes in speech rhythm, and forgetfulness are all reported at standard doses. Some people experience irritability, loss of appetite, feelings of sadness, or trouble sleeping, which can be confusing when you’re taking the drug specifically for anxiety. These effects tend to be strongest when you first start the medication or after a dose increase, and they sometimes ease as your body adjusts.
Memory and Cognitive Effects
Short-term memory problems are one of the more concerning side effects, especially with regular use. Xanax can cause anterograde amnesia, meaning you have difficulty forming new memories while the drug is active. Combined with alcohol, this can escalate to complete memory blackouts.
Long-term use raises additional questions. A meta-analysis of studies on chronic benzodiazepine users found that even after people stopped taking the drug, significant cognitive impairment persisted compared to people who had never used benzodiazepines. Recovery did happen in many areas after quitting, but full restoration of cognitive function was not observed within the first six months. Some deficits may take longer than six months to resolve, and researchers could not rule out that certain effects might be permanent. This is worth weighing if you’ve been taking Xanax regularly for months or years.
Serious Side Effects
Some reactions require immediate medical attention. These include shortness of breath or slowed, difficult breathing, seizures, and signs of a severe allergic reaction: rash, hives, swelling of the face, lips, tongue, or throat, and difficulty swallowing. Respiratory depression, where breathing becomes dangerously slow and shallow, is the most life-threatening risk and is far more likely when Xanax is combined with other substances that suppress the central nervous system.
Paradoxical Reactions
In roughly 1% of users, Xanax produces the opposite of what you’d expect. Instead of calm, people experience agitation, aggression, excessive talkativeness, excitement, confusion, or worsened insomnia. Older adults appear to be more susceptible to these paradoxical reactions. The symptoms typically resolve once the medication is stopped.
Dangerous Interactions
The FDA now requires a boxed warning (its strongest safety label) on all benzodiazepines, including Xanax, highlighting the risks of combining them with opioids or other central nervous system depressants. The combination of Xanax with opioid pain medications, alcohol, or illicit drugs can cause severe respiratory depression and death.
Alcohol deserves special attention. Drinking while taking Xanax doesn’t just add the effects of each substance together. Alcohol actually slows your body’s ability to break down alprazolam, leading to higher drug levels in your blood that last longer than they normally would. The combined effect impairs balance, reaction time, and motor coordination beyond what either substance would do alone, and it can produce partial or total memory blackouts. Three-way combinations of alcohol, opioids, and benzodiazepines are particularly lethal because all three suppress the brainstem circuits that keep you breathing.
Fall Risk in Older Adults
For people over 65, the coordination and sedation effects of Xanax carry a specific, measurable danger: falls and hip fractures. Nearly 400,000 older adults experience hip fractures each year in the United States, and benzodiazepines are among the most common drug contributors. Alprazolam is no exception. Despite being a shorter-acting benzodiazepine, it carries the same fall risk as longer-acting options.
There is no dose at which Xanax effectively treats anxiety while remaining safe from fall risk in this population. The relationship is straightforward: any level of daytime sedation means reduced reaction time and impaired postural control. Higher doses mean greater risk. If you’re an older adult on Xanax or caring for one, visible sedation or a recent fall is a clear signal to discuss tapering with a prescriber.
Dependence and Withdrawal
Physical dependence can develop with regular use, even at prescribed doses. The FDA’s boxed warning explicitly addresses addiction, physical dependence, and withdrawal as risks for the entire benzodiazepine class. Xanax is particularly prone to causing withdrawal problems because it’s short-acting, meaning it leaves your system quickly and your body notices its absence sooner.
Withdrawal symptoms can begin within 24 hours of the last dose. The typical timeline looks like this:
- Days 1 to 4: Early symptoms appear quickly. Anxiety, restlessness, and insomnia are common.
- Days 5 to 14: Symptoms intensify. Panic attacks, sweating, tremors, nausea, and heightened sensitivity to light or sound may develop. Cravings often become stronger during this phase.
- Weeks 2 to 4: This is typically the peak withdrawal period. Insomnia, confusion, and in severe cases, seizures can occur.
- 3 months and beyond: Some people experience protracted withdrawal, with lingering anxiety, depression, and cognitive difficulties lasting months after stopping.
Seizures during withdrawal can be life-threatening. Stopping Xanax abruptly after regular use is dangerous, and gradual tapering under medical supervision is the standard approach to discontinuation.
Risks During Pregnancy
Taking Xanax throughout pregnancy can cause neonatal abstinence syndrome in newborns. Within hours of birth, affected infants may show neurological symptoms like tremor, irritability, and excessive crying, along with digestive issues such as poor feeding, vomiting, and diarrhea. Autonomic symptoms including fever and sweating can also appear, and in serious cases, breathing pauses or spasms may occur. These symptoms generally last one to three days but require careful monitoring. Because of these risks, benzodiazepine prescriptions during pregnancy are typically reserved for situations where the benefit clearly outweighs the potential harm to the infant.