There’s a continued shortage of certain types of Adderall. Experts say patients are having trouble renewing their prescriptions for various types of amphetamines and methylphenidates, the two stimulants commonly used to treat people with ADHD.

If you’re having trouble renewing your Adderall prescription, you should work with your health-care provider to shop at nearby pharmacies or discuss rewriting your prescription to a version of the medication that isn’t in such high demand, experts say.

The Adderall shortage picked up in the fall because Teva, one of the largest producers of the drug, was experiencing manufacturing delays. The Food and Drug Administration says the current shortage, however, is driven by a rise in consumer demand for Adderall and generic alternatives.

Adderall is a highly regulated drug that consists of the stimulant amphetamine, which increases the function of the brain’s prefrontal cortex, helping people to focus their attention and self-regulate. Six million children in the United States have been diagnosed with attention-deficit/hyperactivity disorder (ADHD), according to a survey published by the Centers for Disease Control and Prevention last year. About 62 percentof those children are on medication for ADHD.

The Washington Post spoke with physicians who treat children and adults with ADHD and asked for advice on dealing with the shortage.

“There are a number of other amphetamine products that you can convert people to safely, and they’re equally effective,” said Timothy Wilens, an ADHD expert and chief of child and adolescent psychiatry at Massachusetts General Hospital, in October. “So, there is a solution to it.”

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