Amphetamine-Class Medicines: Side Effects and Safety

Alongside methylphenidate, the amphetamine family accounts for essentially all stimulant prescribing in ADHD. This page describes that family in neutral terms — what these medicines are, what is documented about their effects, and why they are regulated as they are. It contains no doses and no instructions, and it is neither a recommendation nor a warning against use.

The authoritative consumer references are the MedlinePlus pages for dextroamphetamine, for combined dextroamphetamine and amphetamine preparations, and for amphetamine. Those pages carry the complete warnings and should be read from the source.

What These Medicines Are

Amphetamine-class medicines are central nervous system stimulants. Several distinct preparations are prescribed for ADHD: single-isomer dextroamphetamine, mixed amphetamine salt combinations, and prodrug formulations that are converted in the body after being taken. They differ in how quickly an effect begins and how long it lasts.

They are broadly comparable to methylphenidate in the role they play, and clinical guidance generally treats both families as first-line options. Individuals frequently respond differently to the two families, which is why a prescriber may consider one after the other.

Documented Side Effects

Effects vary between individuals and between preparations. Those most commonly documented include:

• Reduced appetite and associated weight change
• Difficulty sleeping
• Dry mouth
• Headache
• Stomach pain or nausea
• Irritability, anxiety or mood changes
• Dizziness
• Increased heart rate

Appetite suppression is described more prominently with this family than with methylphenidate in some accounts, and growth is monitored routinely in children partly for this reason.

More serious effects are documented as well, including cardiovascular effects, circulatory changes in the fingers and toes, new or worsening psychiatric symptoms, and effects on tics. The MedlinePlus pages set out which effects warrant contacting a prescriber promptly. Existing heart conditions, a family history of cardiac problems, certain psychiatric conditions, high blood pressure, glaucoma and interactions with other medicines are all assessed before prescribing — and interactions in this family are a particular consideration, so a prescriber needs a complete list of everything a person takes, including anything bought without a prescription.

Controlled-Substance Status

Amphetamine-class medicines are controlled substances in the United States, reflecting recognised potential for misuse and dependence. Prescribing and refill requirements are correspondingly strict, and secure storage is normally discussed when treatment begins — particularly where an adolescent is involved.

Misuse and Diversion

Misuse of prescription stimulants is a documented concern, and this family features prominently in it. The recognised patterns are taking someone else's prescription, taking more than prescribed, and using the medicine by routes other than as directed.

Two beliefs drive much of the non-medical use among students, and both are worth addressing plainly. The first is that these medicines reliably improve academic performance in people who do not have ADHD — a claim the evidence does not support. The second is that a medicine routinely prescribed to children must be low-risk in any hands, which does not follow: the safety profile that makes supervised prescribing reasonable depends on the supervision.

Diversion — prescribed medicine shared, given away or sold — is the supply side of the same problem, and it is why supervision of supply is emphasised for younger patients.

What This Page Does Not Do

It does not compare this family with methylphenidate or with non-medication approaches, does not rank options, and does not suggest that anything should be used in place of anything else. It also does not advise anyone to stop: concerns about a medicine already prescribed should go to the prescriber or a pharmacist.

For context, see the medication classes overview, the methylphenidate page, and the history of stimulant prescribing, which explains how this range of preparations came about.