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Methylphenidate ER (Relexxii)

Pronunciation: meth-il-FEN-i-dayt

Methylphenidate ER (Relexxii) ballicule: receptor binding, kinetics and half-life diagram
Mechanism of action: Methylphenidate ER (Relexxii) ballicule
Methylphenidate ER (Relexxii) mascot mnemonic cartoon
Visual mnemonic: Methylphenidate ER (Relexxii) mascot
“(It’s a) Relic, see?”

What it isExtended-release dopamine and norepinephrine reuptake inhibitor for ADHD (RELEXXII, 2022; approved ages 6-17, adults).

Why this oneIts osmotic tablet adds 63 and 72 mg single-tablet strengths and provides 10-12 h (Carlat Table 1) of coverage.

What limits itSwallow intact; the shell may appear in stool. Appetite loss, insomnia, blood-pressure elevation, and misuse risk remain.

Methylphenidate ER (Relexxii) molecular structure (skeletal formula)
Molecular structure: Methylphenidate ER (Relexxii)

FDA-approved for

FDA label

BOXED WARNING High potential for abuse and misuse; can lead to substance use disorder including addiction, and misuse/abuse of CNS stimulants can result in overdose and death.
FDA dosingPopulationStartTargetMax
ADHDPeds 6–12 yr18 mg QD (AM)18–54 mg QD54 mg/day
ADHDPeds 13–17 yr18 mg QD (AM)18–72 mg QD72 mg/day (not to exceed 2 mg/kg/day)
ADHDAdults (18 up to 65 yr)18 mg or 36 mg QD (AM)18–72 mg QD72 mg/day

Titration Increase in 18 mg increments at weekly intervals

Renal Undefined

Hepatic Undefined

Instructions

Available strengths

Contraindications

Cautions

Adverse reactions

Pregnancy Published data have not identified drug-associated risk of major birth defects or miscarriage; CNS stimulants may decrease placental perfusion. Pregnancy registry available.

Lactation Methylphenidate present in human milk (infant dose 0.16–0.7% of maternal); monitor infant for agitation, anorexia, reduced weight gain.

Cost

Methylphenidate ER (Relexxii) (RELEXXII)
What pharmacies pay · NADAC 9/30/26
Strength#/mogeneric $/moCostPlus
18 mgER tab30 qd$17.28not offered
27 mgER tab30 qd$20.30not offered
36 mgER tab30 qd$20.15not offered
45 mgER tab30 qd$525.18not offered
54 mgER tab30 qd$24.15not offered
63 mgER tab30 qd$566.23not offered
72 mgER tab30 qd$495.26not offered

Other forms: Methylphenidate (RITALIN) · Methylphenidate ER chewable (QUILLICHEW ER) · Methylphenidate ER suspension (QUILLIVANT XR) · Methylphenidate LA (RITALIN LA) · Methylphenidate ER (OROS) (CONCERTA) · Methylphenidate XR-ODT (COTEMPLA XR-ODT) · Methylphenidate patch (DAYTRANA) · Methylphenidate ER evening-dosed (JORNAY PM) · Methylphenidate CD (METADATE CD) · Methylphenidate oral solution (METHYLIN SOLUTION)

⚠ BOXED WARNING

Classes and tags

Clinical profile

Therapeutic safety burden2 / 4
Overdose danger3 / 4
Weight-gain liability0 / 4
Sedation liability0 / 4
QT / Torsades0 / 4
Direct muscarinic antagonism0 / 4
Embryofetal risk2 / 4

Legacy pregnancy categoryC

Defining liabilityHypertension, appetite/weight effects, misuse and stimulant-induced psychosis or arrhythmia.

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Memory aids: interaction avatars

Methylphenidate ER (Relexxii) no kinetic interactions avatar mnemonic
no kinetic interactions

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