Lortab is a prescription painkiller used to manage pain that is severe enough to require an opioid and that hasn’t responded to milder options like ibuprofen or acetaminophen alone. It combines two active ingredients: hydrocodone, an opioid, and acetaminophen, the same pain reliever found in Tylenol. Because of its potential for abuse and addiction, Lortab is classified as a Schedule II controlled substance and is reserved for situations where non-opioid treatments have failed or aren’t expected to work.
How Lortab Works
The two ingredients in Lortab attack pain through different pathways. Hydrocodone binds to opioid receptors in the brain, mimicking the body’s own pain-suppressing chemicals. This blocks pain signals and can produce feelings of relaxation or euphoria. Acetaminophen works separately by reducing the production of prostaglandins, chemicals your body releases in response to injury that amplify pain and inflammation. Together, the two components provide stronger relief than either would alone.
After you take a tablet, hydrocodone typically reaches its peak blood levels in about 1.3 hours. Pain relief generally lasts four to six hours per dose, which is why prescriptions are written for dosing at those intervals.
Available Strengths
Lortab comes in three tablet strengths, all containing 325 mg of acetaminophen paired with different amounts of hydrocodone:
- 5 mg / 325 mg (lowest strength)
- 7.5 mg / 325 mg
- 10 mg / 325 mg (highest strength)
The usual adult dose is one or two tablets every four to six hours as needed. Your prescriber will choose the strength based on the severity of your pain and whether you’ve taken opioids before.
Common Side Effects
The most frequent side effects fall into two categories: those affecting the brain and those affecting the gut. Drowsiness, dizziness, and lightheadedness are extremely common, especially in the first few days. Some people also experience confusion, poor coordination, or restlessness. These effects tend to be more pronounced at higher doses and often lessen as your body adjusts.
Nausea and vomiting are the most reported gastrointestinal complaints. Constipation is also very common with any opioid and, unlike drowsiness, doesn’t tend to improve over time. Loss of appetite and stomach pain can occur as well. If you notice black or tarry stools, blood in vomit, or severe stomach pain, those are signs of a more serious problem that needs immediate attention.
Serious Risks
Liver Damage
Lortab carries an FDA boxed warning (the most serious type) for liver toxicity. The risk comes from the acetaminophen component. Acute liver failure, sometimes requiring a liver transplant, has occurred in people who exceed 4,000 mg of acetaminophen per day. This limit applies to all sources of acetaminophen combined. If you’re taking Lortab and also using an over-the-counter cold medicine, headache remedy, or sleep aid that contains acetaminophen, you can cross that threshold without realizing it.
Respiratory Depression
At high doses or in people who are especially sensitive, hydrocodone can slow breathing by acting directly on the brainstem. In severe cases, breathing can become irregular or stop entirely. This risk increases significantly if Lortab is combined with alcohol, benzodiazepines (anti-anxiety medications), or other sedatives.
Who Should Not Take Lortab
Lortab is not appropriate for everyone. It is contraindicated in people with significant breathing problems, severe or uncontrolled asthma, known or suspected bowel obstructions, and anyone with a known allergy to hydrocodone or acetaminophen. If you have liver disease, even mild impairment changes how your body processes acetaminophen and may make this medication unsafe.
Dependence and Withdrawal
Physical dependence can develop with regular use, even when you take Lortab exactly as prescribed. Dependence means your body adapts to the drug’s presence and reacts when it’s removed. This is a predictable physiological response, distinct from addiction, though the two can overlap.
If you stop taking Lortab abruptly after using it for more than a few weeks, withdrawal symptoms typically begin within 6 to 12 hours of your last dose. They peak around days two to three and usually resolve within five to seven days. Common withdrawal symptoms include irritability, nausea, muscle aches, anxiety, and insomnia. The severity depends on how much you were taking and for how long. Tapering the dose gradually, rather than stopping all at once, significantly reduces the intensity of withdrawal.
Why It’s Tightly Controlled
Until 2014, hydrocodone combination products like Lortab were classified as Schedule III, meaning they could be called into a pharmacy by phone and refilled up to five times. The DEA reclassified them to Schedule II, the most restrictive category for drugs with accepted medical use. Under Schedule II rules, every fill requires a new written prescription from your provider. No refills are allowed, and no phone-in prescriptions. This change reflected growing recognition that hydrocodone combinations carried the same abuse potential as other strong opioids like oxycodone.