Does ADHD Medication Affect the Heart?

The heart is the most frightening and most distorted subject about ADHD medications. On the internet there are two extremes: "nothing will happen" and "it will wreck your heart."

The truth lies between the two, in a boring place: a measurable but generally small effect, a process managed with follow-up, and a real need for care for a small group. This article describes that framework; the decision and the assessment are the doctor's job.

What happens

Stimulants prolong the action of noradrenaline and dopamine. What this means for the circulatory system is a small rise in blood pressure and pulse in most people.

The language of the guidelines here is careful: the effect is small in group averages, but it varies from person to person, and that is why it needs to be measured (NICE NG87; Kooij et al., 2019).

With non-stimulant medications the picture is different but not zero; with medications such as atomoxetine too, monitoring of pulse and blood pressure is recommended.

What is asked before starting medication

The guidelines recommend taking a history before starting medication. What is asked is usually this:

• Is there a history of unexplained sudden death at a young age in the family?
• Is there a history of congenital heart disease or heart surgery?
• Is there a known rhythm disorder, heart failure or cardiomyopathy?
• Does fainting, chest pain or shortness of breath happen during exertion?
• Is there a diagnosis or treatment of high blood pressure?

If the answer to any of these is yes, it does not mean the medication is forbidden; it means a cardiology assessment comes up.

A routine ECG for everyone is not a standard recommendation in the guidelines; it is requested if there is a risk sign in the history. Practice can vary with the doctor and the center.

What is measured in follow-up

After treatment begins, blood pressure and pulse are a routine part of check-up appointments. Measuring regularly is more valuable than a one-off number: it lets you see the change.

If measurement will be done at home, two things matter. The first is measuring under the same conditions: the same time, seated, after resting a few minutes. The second is writing the number down. In this picture trying to keep it in your head does not work anyway; the logic of the follow-up diary applies here too.

The period after dose increases is also important. A new dose means a new measurement point.

Symptoms to report without delay

These are things to say without waiting for the check-up:

• Chest pain or pressure in the chest.
• Palpitations, a feeling of irregular heartbeat.
• Shortness of breath, especially during exertion.
• Fainting or feeling as if you are about to faint.
• Unusual tiredness during exertion.

Not all of these symptoms have to be related to the heart; anxiety can produce similar things. Telling them apart is the doctor's job, and for the doctor to be able to do it the symptom has to have been reported.

The side confused with anxiety

The feeling of palpitations in many people who take ADHD medication actually comes from anxiety. Anxiety is also one of the known side effects of these medications; I covered it in detail in the article on anxiety.

There is no shortcut for telling these two pictures apart, and trying to tell them apart on your own is not right either. What to do in practice: describe the event (when it happened, how long it lasted, what you were doing), measure the pulse at the time if possible, and tell the doctor.

Caffeine, nicotine and other loads

When taking a stimulant medication, caffeine consumption puts a second load on the same system. Getting by on coffee when appetite is shut is a common behavior, and part of the palpitation complaints comes from here.

Nicotine likewise affects pulse and blood pressure. I wrote in a separate article about why smoking is more attractive in ADHD; when used together with the medication, the load on the circulation increases.

Energy drinks are the riskiest item in this picture: high caffeine, high sugar and often repeated consumption through the day.

What the evidence says

The World Federation consensus statement (Faraone et al., 2021) regards the efficacy and general safety of ADHD medications as documented to a high level; the same text also states that cardiac and circulatory effects need to be monitored.

The meta-analysis by Cortese and colleagues (2018) covers cardiac and circulatory effects in its assessment of tolerability. The summary of the findings is this: changes that are measurable but mostly small, and serious events that are rare.

The word "rare" is important here. Rare is not the same as absent; that is also the reason for follow-up.

What stays with me

The most useful thing I took from this article is turning fear into an action: measuring.

A blood pressure monitor is not expensive, and measuring itself reduces anxiety, because it reduces uncertainty. A few measurements a month produce a number to take to the check-up appointment.

Worry about the heart is a subject that can lead to quietly stopping the medication. Yet when it is talked about, there are plenty of intermediate steps that have solutions: dose, form, caffeine load, measurement routine.

The assessment and the decision are with the doctor. This article is so that you go knowing what to ask.