Starting a new prescription can bring relief and a little worry at the same time. Focus may come back within days, and then a racing pulse on the stairs makes you wonder about your heart. For adults, ADHD medication side effects that involve the heart are small on average, and catching a rise early can save a prescription that is helping. Still, a small average leaves room for one person’s numbers to climb. Knowing your own starting point makes any change easier to judge.
Which ADHD Medication Side Effects Show Up in Adults First
Trouble sleeping, a smaller appetite, and headaches are common in the first few weeks. A faster resting pulse belongs on that list too. Some adults never notice it unless a smartwatch flags it. Stimulants raise norepinephrine, the same chemical that speeds the heart during stress. With short-acting tablets, the pulse can start rising within about an hour of a dose.
Before the first dose, a prescriber looks for anything that would make a small rise risky. During an adult psychiatric evaluation, heart questions come up alongside the usual questions about mood and sleep. A racing heart in the past, chest pain with exercise, or a known heart murmur all belong in that discussion.
Daily habits come up too, since nicotine, alcohol, and decongestants can each raise pulse and pressure with no ADHD medicine involved. MedlinePlus, from the National Library of Medicine, tells people starting methylphenidate to report any heart condition or high blood pressure to their doctor. A doctor may decide against the drug entirely when heart risk runs high.
What a Review of 9,387 Adults Found About Pulse and Pressure
On a home cuff, two readings taken a minute apart can differ by more than two points. In 2025, The Lancet Psychiatry published a review of 102 randomized trials that included 9,387 adults. Against a placebo, adult systolic pressure rose by about 1.7 mm Hg with methylphenidate and 2.3 mm Hg with amphetamines. Pulse climbed by roughly 4 to 6 beats per minute.
Those trials lasted a median of only seven weeks. The authors also rated the adult evidence as very low certainty, so the numbers work best as a rough starting estimate. The adults in those trials averaged 35 years old, so the results say less about people in their 60s.
Viloxazine, a nonstimulant, raised adult pulse by about 5.8 beats per minute, the largest jump in the review. Stimulants showed no larger increases than atomoxetine or viloxazine. Because of that, the review’s authors urged prescribers to check pressure and pulse with every ADHD prescription. Guanfacine moved the other way and lowered blood pressure in the trials that studied it.
ADHD Medication Side Effects That Need a Prompt Call
A group average can hide the one person whose numbers jump. Home readings above 130 over 80 for a week are a reason to call the prescriber within days. So is a resting pulse above 100, or a pounding heartbeat while sitting still. Chest pain, fainting, or sudden weakness on one side calls for 911 right away.
Age changes how ADHD medication side effects on blood pressure play out, since adults over 50 are more likely to start near the high range. For someone at 138 over 88, a two- or three-point rise can cross 140 over 90. More frequent home checks make sense in that situation. Sleep apnea, kidney disease, and weight gain can push pressure up on their own as well.
A call goes faster with three facts ready: the medicine and dose, the date the readings rose, and the highest numbers seen. With those details, a prescriber can usually tell whether to adjust now or wait for the next visit.
A lower dose, a different medication class, or an added blood pressure medicine can each help when a steady climb shows up. Plenty of adults also lean on nonmedication approaches like CBT during the adjustment. Stopping a stimulant suddenly can bring old symptoms back within a day or two, so changes go through the prescriber first.
How Home Readings Help at the Next Appointment
One rushed office reading tells a prescriber less about ADHD medication side effects than a week of home readings. An accurate home reading starts with five minutes of sitting, feet flat and the arm resting at heart level. Coffee or exercise in the 30 minutes before can push the number up. Two readings before the morning dose and two more about three hours after show how far the medicine moves your numbers at its peak. Adults on a long-acting capsule can add an early evening reading, when the effect starts to fade.
Nonstimulants such as atomoxetine and viloxazine act around the clock. Morning and evening readings can look alike on these drugs, so a steady weekly average says more than a before-and-after pair. A cuff that is too small for the upper arm can also read several points high, so cuff size is the first thing to check.
Bringing a written log of those readings to medication management visits lets the prescriber weigh the numbers against your focus, work, and sleep. Short nights and stressful days can push readings up, so those days deserve a note in the log. Either a paper log or a phone note works, as long as each entry has a date and time.
Questions Adults Ask About ADHD Medication Side Effects
Do I need an EKG before starting ADHD medication?
Not always. Adults without heart symptoms or a family history of early heart problems usually start with a pressure check, a pulse, and a health history. A prescriber adds an EKG when that history raises a question. Having answers ready to three questions saves time at the first appointment: Has anyone in your family died suddenly before 50? Have you ever fainted during exercise? Do you take anything for blood pressure, migraines, or congestion?
Can ADHD medication cause high blood pressure over the long term?
The long-term answer is still unsettled. The Lancet Psychiatry review found only four trials with results near six months. None reported a full year. That leaves most of what is known about ADHD medication side effects on blood pressure resting on weeks of data. Long-term users who have a parent with hypertension have extra reason to keep checking.
Does the faster heart rate go away over time?
For some adults, yes. A pulse that runs fast in the first two weeks may settle as the body adjusts. Your resting pulse may still sit well above your pre-medication baseline after a month. If so, a dose change or a different medicine is a fair thing to ask about. A prescriber may also check for thyroid problems or anemia when a fast pulse lingers, since both can raise heart rate by themselves.
When the Numbers Point Toward a Different Plan
Adults who have tried two or three medications and kept running into high readings sometimes quit treatment altogether. Quitting can bring the old focus and work problems right back. A new psychiatrist can review each past trial, its dose, and the readings that came with it during a psychiatric second opinion. Taking the home log and a list of every medication tried to that visit makes the review faster and more complete.
Sources
MedlinePlus, National Library of Medicine. Methylphenidate.
Farhat LC, et al., The Lancet Psychiatry. Comparative cardiovascular safety of medications for attention-deficit hyperactivity disorder in children, adolescents, and adults: a systematic review and network meta-analysis.
