Concerta (Methylphenidate ER).
What It Does, Side Effects, and What to Expect.

Concerta is a brand name for extended-release methylphenidate, delivered through a unique system called OROS (osmotic-release oral system). It is a widely used ADHD medication with a distinct clinical profile from amphetamine-based stimulants like Adderall and Vyvanse. Here is what makes it different and what to expect.

What Is Methylphenidate?

Methylphenidate is a stimulant that works by blocking the reuptake of dopamine and norepinephrine in the brain -- keeping these neurotransmitters active in the synapse longer. This is a different mechanism from amphetamines (Adderall, Vyvanse), which actively trigger the release of dopamine and norepinephrine in addition to blocking reuptake. In practical terms, methylphenidate tends to have a somewhat milder stimulant effect and may be slightly less anxiogenic, which makes it a preferred starting point for some patients -- particularly those with co-occurring anxiety.

How OROS Delivery Works

Concerta's delivery system is one of its defining features. The tablet uses water pressure to push medication out of a small laser-drilled hole over the course of the day:

• Approximately 22% of the dose is released immediately when swallowed
• The remaining 78% is released gradually over 8 to 10 hours as the tablet absorbs water and expands

This creates a rising concentration curve through the morning and early afternoon, which is designed to match natural cognitive demands across the day. The empty tablet shell passes in the stool -- this is normal and not a sign the medication was not absorbed.

Duration: typically 10 to 12 hours from a single morning dose.

Dosing

Concerta comes in 18 mg, 27 mg, 36 mg, and 54 mg tablets. Starting dose for adults is typically 18 to 36 mg once daily in the morning. Maximum adult dose is 72 mg. Tablets should be swallowed whole and not crushed or chewed -- crushing disrupts the OROS delivery system and would release the full dose immediately.

Common Side Effects

• Appetite suppression -- consistent; eat breakfast before taking the medication
• Insomnia -- take in the morning; late-morning doses can push the wear-off into evening
• Headache -- particularly at peak levels or during wear-off
• Stomachache or nausea -- common early in treatment; taking with food reduces this
• Elevated heart rate and blood pressure -- monitor at follow-ups
• Irritability or mood changes -- sometimes during wear-off
• Dry mouth

Concerta vs. Adderall and Vyvanse

All three are Schedule II stimulants used for ADHD. The key distinctions:

• Mechanism: Methylphenidate (Concerta) blocks reuptake. Amphetamines (Adderall, Vyvanse) also trigger release. Amphetamines are generally considered more potent per milligram.
• Anxiety: Some patients with co-occurring anxiety tolerate methylphenidate better. This is not universal -- individual responses vary significantly.
• Duration: Concerta 10 to 12 hours; Adderall XR 8 to 10 hours; Vyvanse 10 to 14 hours.
• Cost: Generic methylphenidate ER is among the most affordable ADHD medications. Vyvanse has generics as well but pricing varies.

Ritalin vs. Concerta

Both use methylphenidate. Ritalin is the immediate-release (IR) formulation lasting 3 to 5 hours; Concerta is the extended-release version lasting 10 to 12 hours. Ritalin offers more timing flexibility and is useful as a booster dose. See our Ritalin guide for more detail on the short-acting option.