There is no fixed time limit for taking methotrexate. Many people stay on it for years or even decades, as long as regular blood tests show it remains safe and it continues to control their condition. In rheumatoid arthritis studies, about 72% of patients who switched to the injectable form remained on it for at least five years, and roughly 30% were still taking it at the ten-year mark. The drug is designed for long-term use, but how long you personally take it depends on how well it works, how your body tolerates it, and whether your health circumstances change.
The Minimum Trial Period
Methotrexate is slow to take effect. Most guidelines recommend staying on it for at least six months before deciding whether it’s working, provided you notice some improvement within the first three months. During that window, your provider will gradually increase the dose to find the right level. Abandoning it too early is one of the most common reasons people miss out on its benefits.
Why Many People Stay on It for Years
For conditions like rheumatoid arthritis, methotrexate is typically taken indefinitely. It doesn’t cure the underlying disease; it suppresses the immune activity driving it. Stopping the drug usually means symptoms return. One notable finding: patients with rheumatoid arthritis who used methotrexate for more than a year had a 70% lower mortality rate compared to those who didn’t, even among people who eventually switched to a different medication. That survival benefit is a major reason providers encourage long-term use when the drug is tolerated well.
For psoriasis, the picture is similar. A real-world study tracking patients on methotrexate for an average of about four and a half years (with some staying on it nearly 15 years) found that skin improvement was significant within the first six months and remained stable after that. Across 247 patient-years of follow-up, no serious adverse events were recorded. A separate 22-year observation study of 113 psoriasis patients on low-dose methotrexate also found the drug to be effective and safe over the long haul.
What Long-Term Use Does to Your Liver
The liver is the organ most closely watched during methotrexate therapy. Over time, approximately 30% of patients develop mild-to-moderate changes visible on liver biopsy, such as fatty deposits or minor inflammation. Between 2% and 20% develop some degree of liver scarring (fibrosis). These numbers come from routine monitoring at one- to two-year intervals or when cumulative doses reach certain thresholds.
In practice, significant liver damage is uncommon at the low doses used for autoimmune conditions. The psoriasis study mentioned above found that liver enzyme levels rose slightly after two to three years of treatment, but the increases weren’t clinically meaningful. Interestingly, when patients do stop methotrexate because of abnormal liver tests, the liver problems don’t always resolve, suggesting that factors like fatty liver disease are often the real culprit rather than the drug itself.
Blood Tests That Keep You Safe
Regular monitoring is what makes long-term use possible. The standard schedule looks like this:
- Starting phase: Blood tests every two weeks until your dose is stable for about six weeks.
- First three months on a stable dose: Monthly blood tests checking your blood cell counts, liver enzymes, and kidney function.
- After three months: Blood tests every 12 weeks, continuing for as long as you take the drug.
These tests catch problems early. A drop in white blood cells, a spike in liver enzymes, or declining kidney function can all prompt a dose adjustment or a temporary pause. If you’ve been on methotrexate for years without issues, the every-12-weeks schedule is generally sufficient, though people at higher risk for side effects may need more frequent checks.
Folic Acid Makes a Difference
Methotrexate works partly by interfering with how your body uses folate, a B vitamin. That same mechanism is responsible for many of its side effects: nausea, mouth sores, fatigue, and hair thinning. Taking 1 mg of folic acid on the days you don’t take methotrexate significantly reduces these problems. If you still have stomach issues, the dose can be increased to 5 mg. Skipping folic acid supplementation is one of the most avoidable mistakes people make on this drug.
Alcohol and Methotrexate
Older guidelines recommended near-total abstinence from alcohol while on methotrexate, and that advice still circulates widely. More recent evidence paints a clearer picture. The largest study on this topic found that drinking fewer than 14 units of alcohol per week (roughly seven standard drinks in the U.S.) carried less than a 1% chance of a clinically meaningful increase in liver stress. Drinking above 21 units per week, on the other hand, nearly doubled the risk of elevated liver enzymes. The practical takeaway: light to moderate drinking appears safe for most people on methotrexate, but heavy drinking is a genuine risk.
Common Reasons People Stop
Not everyone stays on methotrexate forever. In a large retrospective study, the most common reasons for stopping were infections (20%), a new cancer diagnosis (14.1%), and lung problems (10.2%). Liver dysfunction accounted for about 8% of discontinuations. Some people stopped for non-medical reasons: planning a pregnancy (5.1%), personal preference (4.3%), achieving remission (5.6%), or reaching an age where the risks no longer justified the benefits (2.6%).
Lung complications deserve special attention because they can appear at any point during treatment, not just early on. A persistent dry cough or unexplained shortness of breath should be evaluated promptly, as methotrexate can occasionally cause inflammation in the lungs that requires stopping the drug.
Pregnancy and Planning Ahead
Methotrexate causes birth defects and must be stopped well before conception. The drug label recommends waiting three to six months after your last dose before trying to become pregnant. Some providers consider one to three months sufficient, but the more conservative timeline gives you the widest safety margin. Men taking methotrexate should also use effective contraception during treatment and for at least three months after stopping. If pregnancy is in your plans, this is something to discuss with your provider early so you can transition to a safer medication.
What Keeps You on It Longer
The people who do well on methotrexate long-term tend to share a few things in common: they take folic acid consistently, they show up for blood tests on schedule, they keep alcohol intake moderate, and they report new symptoms early rather than waiting. The drug’s side effects are real but manageable for most people, and the benefits for controlling joint damage, skin disease, and systemic inflammation are well established over decades of use. There is no built-in expiration date on methotrexate therapy. As long as it’s working and your labs look good, continued use is not just acceptable but often the recommended course.