Hydrocodone Explained: Medical Uses, Benefits, Risks, and Safe Use

If you've ever had surgery, a serious injury, or a painful dental procedure, you may have been handed a prescription for hydrocodone. It's one of the most widely prescribed pain medications in the United States, and also one of the most misunderstood. Here is what it does, what to watch for, and how to keep yourself and your family safe.

Hydrocodone is a prescription opioid pain reliever. It is usually combined with another drug, most often acetaminophen (the ingredient in Tylenol), in products such as Norco or Vicodin. Extended-release, hydrocodone-only versions exist too, but they are meant for severe, long-term pain when other treatments haven't worked.

The U.S. Drug Enforcement Administration classifies hydrocodone as a Schedule II controlled substance. That means it has accepted medical uses but also a high potential for misuse and dependence. Since 2014, prescriptions have required stricter handling, and refills generally need a new authorization.

Hydrocodone is often prescribed in a tablet that also contains acetaminophen, so one pill delivers two different drugs. MedlinePlus, the U.S. National Library of Medicine's drug guide, notes that its hydrocodone guide covers only hydrocodone, so you should also read about the other ingredient in your product.

Hydrocodone

Acetaminophen

Drug type

Opioid (opiate) pain reliever

Pain reliever and fever reducer

What it does

Changes how the brain and nervous system respond to pain

Relieves pain and lowers fever

Biggest danger

Slowed or stopped breathing; dependence; accidental ingestion by others

Severe liver injury if too much is taken

Hospital treatment for overdose

Naloxone or similar rescue medicine

N-acetylcysteine

Legal status

Schedule II controlled substance (combination products)

Over the counter on its own

Forms and timing. Tablets, syrup, and oral solutions are usually taken every 4 to 6 hours as needed, according to MedlinePlus. Your dose and schedule come from your prescriber and your pharmacy label, not from this article. If you use a liquid, measure it with a dropper, medicine spoon, or oral syringe rather than a kitchen teaspoon.

Strengths. Tablet labels list hydrocodone first, then acetaminophen, for example 5 mg/325 mg. The FDA's 2011 safety communication lists Norco in 5, 7.5, and 10 mg hydrocodone strengths, each with 325 mg of acetaminophen.

Brand names. Norco, Vicodin, and Lortab are well-known names. MedlinePlus notes that many of these brands are no longer sold, though generic versions remain available, so your bottle may carry only the generic name.

Acetaminophen is safe at the right dose, but too much can cause severe liver injury. In January 2011 the FDA asked manufacturers to cap acetaminophen at 325 mg per tablet or capsule in prescription products, and to add a boxed warning about severe liver injury plus a warning about allergic reactions. The FDA tells clinicians to advise patients not to exceed 4 grams (4,000 mg) of acetaminophen per day from all sources. Your prescriber may set a lower limit for you.

The same FDA page reports that from 1998 to 2003 acetaminophen was the leading cause of acute liver failure in the United States, and that 48% of those acetaminophen-related cases involved accidental overdose.

FDA advice for anyone taking a prescription product that contains acetaminophen:

• Read every prescription and over-the-counter label, and ask your pharmacist whether your pain medicine contains acetaminophen.

• Never take two acetaminophen-containing products at the same time, and never take more than directed.

• Don't drink alcohol while taking it.

• Stop and get medical help right away if you think you took too much, or if you develop swelling of the face, mouth, or throat, difficulty breathing, itching, or a rash.

Label abbreviations. Prescription labels may not spell out the word. The FDA lists APAP, AC, Acetaminophn, Acetaminoph, Acetaminop, Acetamin, and Acetam as variants.

An overdose can hurt the liver even if you feel fine. MedlinePlus warns that a person can survive the opioid part of a hydrocodone and acetaminophen overdose and still suffer serious liver injury, including liver failure that may need a transplant. Yellow skin and eyes (jaundice) are a sign of liver failure.

Hydrocodone attaches to opioid receptors in the brain, spinal cord, and other parts of the body. This changes how your nervous system perceives and responds to pain. It doesn't repair the source of the pain. It makes the pain less noticeable.

That is why doctors typically reserve it for short-term use in moderate to severe pain, when non-opioid options such as ibuprofen or acetaminophen alone aren't enough.

Many people tolerate hydrocodone with only mild effects, but these are common:

• Drowsiness or dizziness

• Nausea or vomiting

• Constipation

• Dry mouth

• Itching

Constipation is worth taking seriously, since it rarely improves on its own while you're taking an opioid. Ask your pharmacist about gentle ways to manage it.

Slowed breathing. The most dangerous risk of any opioid is respiratory depression, where breathing becomes dangerously slow or shallow. The risk is highest when starting the medication, after a dose change, or when it's combined with other substances.

Dangerous combinations. Mixing hydrocodone with alcohol, benzodiazepines (such as Xanax or Valium), sleep aids, or other sedating drugs can be life-threatening. The FDA carries a boxed warning about this on opioid labels. Always tell every doctor and pharmacist what you take, including over-the-counter products and supplements.

Acetaminophen overload. Because many hydrocodone products contain acetaminophen, taking additional cold medicines, pain relievers, or sleep products that also contain it can add up to a dose that harms the liver. Read labels carefully and ask your pharmacist if you're unsure.

Dependence and addiction. Your body can become physically dependent on opioids even when you take them exactly as prescribed. Dependence is not the same as addiction, but the two can overlap. Addiction involves compulsive use despite harm. Long-term use, a personal or family history of substance use, and untreated mental health conditions raise the risk.

Before you start, tell your doctor and pharmacist if any of these apply, as MedlinePlus advises:

• Slowed breathing, asthma, COPD, or other lung problems

• A blocked or narrowed stomach or intestine, or paralytic ileus

• A brain tumor, a condition that raises pressure in the brain, or seizures

• Thyroid, liver, pancreas, gallbladder, heart, or kidney disease

• Heavy alcohol use, street drug use, overuse of prescription medicines, a past overdose, or depression or another mental illness

• An allergy to acetaminophen or any other ingredient

Interacting medicines. Alcohol, street drugs, and certain medicines raise the risk of serious breathing problems, sedation, or coma. Also mention any use in the past two weeks of isocarboxazid, linezolid, methylene blue, phenelzine, selegiline, or tranylcypromine. St. John's wort and tryptophan can interact too, and MedlinePlus suggests asking your doctor about grapefruit and grapefruit juice.

Pregnancy and breastfeeding. If you take a hydrocodone combination product regularly during pregnancy, your baby may have life-threatening withdrawal symptoms after birth. Tell your doctor if you are pregnant, plan to become pregnant, or are breastfeeding.

Standing up. Hydrocodone can cause dizziness or fainting when you rise quickly, especially at the start. Get up slowly and rest your feet on the floor for a few minutes first.

These habits, consistent with guidance from the FDA and CDC, lower the risk of harm:

1. Take it exactly as prescribed. Don't take extra doses, and don't stretch the time between doses in ways your prescriber didn't recommend.

2. Use the lowest effective amount for the shortest time needed. Talk to your doctor about a plan for stopping.

3. Don't drink alcohol while taking it.

4. Don't drive or operate machinery until you know how it affects you.

5. Never share your prescription. A dose that is safe for you can be dangerous for someone else.

6. Don't stop suddenly after taking it for a while. Ask your prescriber how to taper to avoid withdrawal symptoms.

Opioids are a leading cause of accidental poisoning in children and a common source of misuse among teens. Store your medication in a locked place, out of sight and reach. When you no longer need leftover pills, don't keep them "just in case."

The safest disposal route is a drug take-back program. Many pharmacies and police stations offer drop-off boxes, and the DEA holds National Prescription Drug Take Back Days. If no option is available, the FDA provides specific instructions for certain medications, so check its guidance for your product.

Naloxone (Narcan) can temporarily reverse an opioid overdose. Many doctors now recommend keeping it at home when someone in the household has an opioid prescription. In many U.S. states it's available at pharmacies without a prescription. Make sure family members know where it is and how to use it.

Call 911 if someone taking hydrocodone shows these signs:

• Very slow, shallow, or stopped breathing

• Extreme sleepiness or inability to wake up

• Blue or gray lips or fingertips

• Small, pinpoint pupils with unresponsiveness

If you or someone you know is struggling with opioid use, the SAMHSA National Helpline (1-800-662-4357) offers free, confidential, 24/7 support and treatment referrals.

Hydrocodone can be an effective, appropriate tool for short-term pain relief when used under medical supervision. The goal is simple: treat your pain while protecting your health. Ask questions, follow your prescriber's instructions, store it securely, and dispose of leftovers promptly.

• U.S. Food and Drug Administration (FDA) opioid safety resources

• Centers for Disease Control and Prevention (CDC) Clinical Practice Guideline for Prescribing Opioids

• National Institute on Drug Abuse (NIDA)

• MedlinePlus (National Library of Medicine)