When most people think about ADHD medication, stimulant medications such as methylphenidate (Ritalin) are usually the first treatments that come to mind. These medicines help many people manage symptoms such as inattention, impulsivity and hyperactivity. However, they are not effective for everyone, and some people experience side effects that make them difficult to use long term.
Exciting new research has identified an unexpected possibility: a common blood pressure medication called amlodipine may have the potential to help treat ADHD symptoms.
Researchers from several European institutions explored whether existing medicines could be repurposed as alternative ADHD treatments. Their work focused on amlodipine, a medication widely prescribed to treat high blood pressure, often under the brand name Norvasc.
The researchers first tested the drug using animal models commonly used in ADHD research. In one study, rats displaying ADHD-like traits were given a range of different treatments. Amlodipine was the only medication that produced a significant improvement in behaviour.
The research team then moved on to genetically modified zebrafish that demonstrated hyperactive and impulsive behaviours similar to some ADHD symptoms. Remarkably, when the fish were treated with amlodipine, these behaviours were significantly reduced.
The researchers also compared amlodipine with methylphenidate (Ritalin), one of the most commonly prescribed ADHD medications. In these experiments, both drugs showed similar effects in reducing impulsive behaviour.
It is important to keep these findings in perspective. The results come primarily from animal studies, which means we do not yet know whether the same benefits would be seen in people with ADHD. Many treatments that show promise in animal research do not always translate into effective human therapies.
However, there is another intriguing piece of evidence. The researchers examined data from the UK Biobank, looking at people who were already taking amlodipine for high blood pressure. Although this was an observational study and cannot prove cause and effect, people taking amlodipine appeared less likely to report mood swings and risk-taking behaviours, both of which can be associated with ADHD.
One of the most significant advantages of this research is that amlodipine is already a licensed and widely used medication. Tens of millions of people worldwide take it regularly, meaning doctors already understand its safety profile, benefits and side effects. This could potentially shorten the time needed to evaluate its suitability as an ADHD treatment compared with developing an entirely new medication from scratch.
That said, amlodipine is not without side effects. Some people experience fatigue, nausea or gum-related problems, so it would not necessarily be a perfect solution for everyone.
For now, nobody should consider amlodipine an ADHD treatment outside of clinical research. Further human studies are needed before any conclusions can be drawn.
Nevertheless, this research highlights something encouraging: scientists are continuing to look for new and safer treatment options, expanding the choices available to people living with ADHD. For those who have struggled to find a medication that works well for them, that is welcome news indeed.
Source: ScienceAlert, reporting on research published in Neuropsychopharmacology (2025).