Xanax (alprazolam) comes in four immediate-release tablet strengths: 0.25 mg, 0.5 mg, 1 mg, and 2 mg. An extended-release version, Xanax XR, adds a 3 mg option to that lineup. The dose a person takes depends on the condition being treated, their age, and how their body responds over time.
Immediate-Release Tablet Strengths
Standard Xanax tablets are designed to be taken multiple times per day and come in four strengths: 0.25 mg, 0.5 mg, 1 mg, and 2 mg. Generic versions are available in the same strengths and are often color-coded by dose, though colors can vary between manufacturers. The 0.25 mg is typically the lowest prescribed tablet, making it the usual starting point for many patients.
Extended-Release Tablet Strengths
Xanax XR tablets release the medication gradually and are taken once daily rather than multiple times a day. They come in 0.5 mg, 1 mg, 2 mg, and 3 mg strengths. Each strength has a distinct shape and color: the 0.5 mg is a white pentagon, the 1 mg is a yellow square, the 2 mg is a blue circle, and the 3 mg is a green triangle. The 3 mg strength is unique to the extended-release form and isn’t available as an immediate-release tablet.
Oral Solution
Xanax also comes as a concentrated liquid (Alprazolam Intensol) at 1 mg per mL. This form allows for very precise dose adjustments, which is particularly useful for people who have difficulty swallowing tablets or who need doses that fall between standard tablet strengths, such as during a gradual taper.
Typical Doses for Anxiety
For generalized anxiety disorder, the recommended starting dose is 0.25 mg to 0.5 mg taken three times daily. That puts most people at 0.75 mg to 1.5 mg per day to start. From there, the dose can be adjusted based on how well symptoms respond. The maximum recommended daily dose for anxiety is 4 mg, split across multiple doses throughout the day.
Typical Doses for Panic Disorder
Panic disorder generally requires higher doses than generalized anxiety. The starting dose is 0.5 mg three times daily (1.5 mg per day total). Increases happen gradually, no more than 1 mg per day added every three to four days, to give the body time to adjust.
In clinical trials, patients with panic disorder took an average of 5 to 6 mg per day, with some requiring up to 10 mg daily. For anyone taking more than 4 mg per day, periodic reassessment is standard to make sure the dose is still appropriate.
Lower Doses for Older Adults and Liver Disease
Older adults and people with advanced liver disease start at lower doses because their bodies process the medication more slowly. For immediate-release tablets, the typical starting dose for these groups is 0.25 mg taken two or three times daily. For Xanax XR, the starting dose is 0.5 mg once daily. From either starting point, the dose can be increased cautiously if needed.
This matters because Xanax is broken down by the liver, and the drug’s average half-life (the time it takes for your body to clear half of a dose) is about 11 hours in healthy adults, with a range of roughly 6 to 27 hours. In people whose liver function is compromised, or in older adults whose metabolism has slowed, the drug lingers longer and its effects are stronger at the same dose.
How Doses Are Adjusted Over Time
Xanax dosing isn’t usually static. Most prescribers start low and increase gradually, a process called titration. The goal is to find the lowest effective dose, since higher doses carry greater risks of sedation and dependence.
Immediate-release tablets reach their peak concentration in your bloodstream within one to two hours, which means effects come on relatively quickly. That fast onset is part of what makes Xanax effective for acute anxiety, but it also means the medication wears off between doses, which is why it’s typically taken two or three times a day.
Tapering Off Xanax
Stopping Xanax abruptly after regular use can cause withdrawal symptoms, so doses are reduced gradually. A typical approach starts with an initial reduction of 5% to 25% of the current dose, followed by further reductions of 5% to 25% every one to four weeks depending on how the person tolerates the change. People on particularly high doses may see a faster initial reduction of 25% to 30%, with smaller, slower decreases from there. The liquid form can be especially helpful during tapering because it allows for tiny, precise dose adjustments that tablets can’t match.