Quick Reference
Black Box Warning Drugs at a Glance
All 20 drugs below carry at least one FDA black box warning. Risk score reflects severity of known boxed warnings.
| Drug Name | Warning Category | Risk Score | Primary Risk | Profile |
|---|---|---|---|---|
| Cipro (ciprofloxacin) | Fluoroquinolone Antibiotics | High | Nerve damage, tendon rupture, psychiatric effects | View Profile → |
| Levaquin (levofloxacin) | Fluoroquinolone Antibiotics | High | Nerve damage, tendon rupture, arrhythmia | View Profile → |
| Avelox (moxifloxacin) | Fluoroquinolone Antibiotics | High | Nerve damage, tendon rupture, QT prolongation | View Profile → |
| OxyContin (oxycodone) | Opioid Pain Medications | Critical | Addiction, fatal respiratory depression | View Profile → |
| Vicodin (hydrocodone/acetaminophen) | Opioid Pain Medications | Critical | Addiction, fatal respiratory depression | View Profile → |
| Fentanyl (fentanyl) | Opioid Pain Medications | Critical | Addiction, extreme overdose risk | View Profile → |
| Tramadol (tramadol) | Opioid Pain Medications | Critical | Addiction, seizures, serotonin syndrome | View Profile → |
| Methadone (methadone) | Opioid Pain Medications | Critical | Cardiac arrhythmia, overdose risk | View Profile → |
| Xanax (alprazolam) | Benzodiazepines | Critical | Dependence, withdrawal seizures, overdose | View Profile → |
| Valium (diazepam) | Benzodiazepines | Critical | Dependence, withdrawal seizures, CNS depression | View Profile → |
| Ativan (lorazepam) | Benzodiazepines | Critical | Dependence, withdrawal, respiratory depression | View Profile → |
| Klonopin (clonazepam) | Benzodiazepines | Critical | Dependence, withdrawal seizures | View Profile → |
| Seroquel (quetiapine) | Antipsychotics | High | Increased mortality in elderly with dementia | View Profile → |
| Abilify (aripiprazole) | Antipsychotics | High | Increased mortality in elderly with dementia | View Profile → |
| Zyprexa (olanzapine) | Antipsychotics | High | Increased mortality in elderly, metabolic effects | View Profile → |
| Accutane (isotretinoin) | Other High-Risk Medications | High | Severe birth defects, depression, IBD | View Profile → |
| Methotrexate (methotrexate) | Other High-Risk Medications | Critical | Fatal liver/lung toxicity, birth defects | View Profile → |
| Warfarin (warfarin) | Other High-Risk Medications | High | Life-threatening bleeding | View Profile → |
| Ritalin (methylphenidate) | Other High-Risk Medications | Moderate | Abuse potential, cardiovascular effects | View Profile → |
| Xeljanz (tofacitinib) | Other High-Risk Medications | Critical | Blood clots, serious infections, malignancy | View Profile → |
What Is It
What Is an FDA Black Box Warning?
A black box warning — formally called a boxed warning — is the FDA's most serious drug safety label. It gets its name from the literal black border that surrounds the warning text at the top of a drug's prescribing information. This visual distinction exists for one reason: to make sure no physician, pharmacist, or patient can miss it.
The FDA requires a boxed warning only when clinical trials or post-market surveillance data show a drug can cause severe, life-threatening, or irreversible harm. This could be death from respiratory depression, permanent nerve damage, severe birth defects, increased cancer risk, or fatal organ failure. The bar is deliberately high — thousands of drugs have serious side effects, but only a fraction carry the black box.
⬛ What a black box means in plain language
This medication can seriously injure or kill people under specific conditions. These risks are significant enough that the FDA is legally requiring they be prominently disclosed — not buried in fine print — before a doctor prescribes or a patient takes the drug.
Approximately 400+ FDA-approved prescription drugs currently carry at least one boxed warning. Some carry multiple warnings covering different risks. A new boxed warning can be added at any time — even decades after a drug is approved — if post-market data reveals a previously unknown serious risk.
Risk Categories
Why Do Drugs Get Black Box Warnings?
The FDA issues boxed warnings across four broad categories of serious risk:
Death Risk
The drug can directly cause death under predictable conditions — opioid overdose, respiratory depression, fatal cardiac arrhythmias, or lethal interactions with other substances.
Serious Organ Damage
Irreversible damage to major organs: liver failure (acetaminophen overdose, methotrexate), kidney failure, severe nerve damage (fluoroquinolones), or bone marrow suppression.
Addiction & Dependence
High potential for physical dependence or psychological addiction, with dangerous or life-threatening withdrawal syndrome if the drug is stopped abruptly. Opioids and benzodiazepines are primary examples.
Birth Defects & Fetal Harm
The drug causes severe or fatal fetal abnormalities when taken during pregnancy. Accutane (isotretinoin) has one of the most extensive pregnancy restriction programs in FDA history due to catastrophic birth defect rates.
Complete List
PillScope Drugs with FDA Black Box Warnings
All 20 drugs below carry at least one FDA black box warning. Click any drug to see its full risk profile, adverse event data, and the exact text of its warning.
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Fluoroquinolones
Nerve damage · Tendon rupture · Psychiatric effects
Fluoroquinolone antibiotics like Cipro and Levaquin carry boxed warnings for permanent nerve damage (peripheral neuropathy), tendon rupture, and serious psychiatric effects including psychosis and suicidal thoughts — risks that can persist long after the course of antibiotics ends.
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Opioids
Addiction · Fatal respiratory depression · Overdose death
Opioids carry the most serious boxed warnings in medicine. They cause physical dependence and addiction with all extended-release formulations, and can suppress breathing to the point of death — a risk that spikes when combined with benzodiazepines, alcohol, or other CNS depressants.
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Benzodiazepines
Dependence · Withdrawal seizures · CNS depression
Benzodiazepines like Xanax and Valium carry boxed warnings for physical dependence, abuse potential, and life-threatening withdrawal. When combined with opioids, their combined CNS depression effect has caused tens of thousands of overdose deaths in the US.
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Antipsychotics
Increased mortality in elderly · Metabolic syndrome
Atypical antipsychotics carry a boxed warning for significantly increased risk of death in elderly patients with dementia-related psychosis. These drugs are not FDA-approved for that use, but are sometimes prescribed off-label — the boxed warning exists specifically to flag this off-label mortality risk.
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Other High-Risk
Organ toxicity · Severe birth defects · Blood clots
This category includes drugs with severe but category-specific risks: Accutane causes catastrophic birth defects, Methotrexate causes fatal liver and lung toxicity, Warfarin causes life-threatening bleeding, and Xeljanz carries boxed warnings for blood clots, serious infections, and malignancy.
Common Questions
Black Box Warning FAQ
A black box warning (formally called a boxed warning) is the FDA's most serious drug safety label. It appears in a prominent black-bordered box at the top of a drug's prescribing information when clinical studies or post-market data show the drug carries significant risks of serious injury, life-threatening reactions, or death — risks serious enough that they may outweigh the drug's benefits in some patients. The FDA has required boxed warnings on more than 400 prescription drugs.
Fentanyl and other opioids are among the most dangerous drugs with black box warnings, responsible for over 80,000 overdose deaths per year in the US. Methotrexate is another extremely high-risk drug — it can cause fatal liver toxicity, fatal lung disease, and severe birth defects. Xeljanz (tofacitinib) carries one of the newest critical-level boxed warnings for blood clots, serious infections, and increased cancer risk.
More than 400 FDA-approved prescription drugs carry at least one black box warning. Some drugs have multiple boxed warnings covering different risks. Common categories include opioid pain medications, benzodiazepines (like Xanax and Valium), antidepressants (increased suicidality risk in young patients), fluoroquinolone antibiotics, blood thinners, and immunosuppressants. The number grows each year as post-market surveillance data reveals new serious risks.
Most people take drugs with black box warnings without incident — the warning means there is a known serious risk under specific conditions, not that the drug is automatically dangerous for every patient. What matters is informed awareness: know what the warning covers, what symptoms to watch for, what interactions to avoid, and when to call your doctor. Never stop a black box warning drug abruptly without medical guidance — for opioids, benzodiazepines, and antiepileptics, sudden discontinuation can trigger life-threatening withdrawal.
Yes, but it is rare. The FDA can remove a boxed warning if subsequent clinical data shows the risk was overestimated or is no longer clinically significant. More commonly, warnings are updated to be more specific rather than removed entirely. A new boxed warning can also be added at any time — even decades after approval — if post-market surveillance reveals a previously unknown serious risk. The black box warning system is designed to evolve as real-world safety data accumulates.
Yes. A black box warning does not prohibit prescribing. It means the FDA requires that doctors and patients be explicitly informed about specific serious risks before the drug is used. For serious conditions — cancer, severe chronic pain, treatment-resistant psychiatric illness — drugs with boxed warnings are often the appropriate and sometimes only effective treatment. The warning ensures informed consent, not a ban on use.
Every drug has standard warnings and precautions in its label, but a black box warning is reserved exclusively for risks that are severe, life-threatening, or irreversible. The physical black border requirement ensures these warnings are visually unmissable among the thousands of standard precautions in drug labeling. Black box warnings typically require special monitoring, restricted prescribing programs, or mandatory patient registries (called REMS programs).
Do not stop taking the drug without talking to your doctor first — abruptly stopping opioids, benzodiazepines, or antiepileptics can cause dangerous or life-threatening withdrawal. Instead: (1) Ask your doctor specifically what the boxed warning covers and whether it applies to your situation. (2) Know the warning signs to watch for. (3) Understand what interactions and substances to avoid. (4) Ask whether safer alternatives exist for your condition. Being informed is the goal — not alarm.
No. Black box warnings apply only to FDA-approved prescription drugs. Over-the-counter medications have their own warning labels (often "Drug Facts" panels), but they do not carry the FDA's boxed warning designation. Some drugs that previously required a prescription and carried boxed warnings have been approved for OTC use in lower doses — but the OTC version does not carry the black box, since it is intended for self-limiting conditions at doses where the serious risks no longer apply.
Medical Disclaimer: PillScope provides educational information only. This page is not medical advice. Do not stop or change any medication without consulting your doctor or pharmacist. FDA adverse event data reflects voluntary reports and does not establish that a drug caused a specific outcome.