ADDERALL XR 25
Clinical safety rating: caution
Comprehensive clinical and safety monograph for ADDERALL XR 25 (ADDERALL XR 25).
Adderall XR is a combination of dextroamphetamine and amphetamine, which are non-catecholamine sympathomimetic amines that promote release of catecholamines (primarily dopamine and norepinephrine) from presynaptic nerve terminals and inhibit their reuptake, resulting in increased synaptic concentrations. This leads to CNS stimulation.
| Metabolism | Amphetamine is metabolized by CYP2D6 (major pathway) and to a lesser extent by CYP3A4 and CYP1A2. Dextroamphetamine is also metabolized by CYP2D6. Both undergo deamination and oxidation. Renal excretion of unchanged drug and metabolites. |
| Excretion | Renal: approximately 90% (30-40% unchanged, remainder as metabolites); fecal: minimal (<2%) via biliary elimination. |
| Half-life | Dextroamphetamine: 10-13 hours; levoamphetamine: 11-14 hours. Effective half-life supports once-daily dosing with extended duration. |
| Protein binding | Fisio: 16% (dextroamphetamine and levoamphetamine) primarily to albumin. |
| Volume of Distribution | Dextroamphetamine: 3.5-4.5 L/kg; levoamphetamine: 3.0-4.0 L/kg. Indicates extensive tissue distribution. |
| Bioavailability | Oral: 95-100% for immediate-release; extended-release formulation approximates 100% relative to immediate-release. |
| Onset of Action | Oral: 1-2 hours (peak plasma concentration at 3-5 hours with extended-release formulation). |
| Duration of Action | Oral: 10-12 hours due to extended-release formulation; therapeutic effects last through the waking day. |
20-60 mg orally once daily in the morning; starting dose 20 mg, titrate weekly by 10-20 mg based on response and tolerability.
| Dosage form | CAPSULE, EXTENDED RELEASE |
| Renal impairment | GFR 30-89 mL/min: no adjustment; GFR 15-29 mL/min: reduce dose by 50%; GFR <15 mL/min or dialysis: not recommended. |
| Liver impairment | Child-Pugh Class A: no adjustment; Child-Pugh Class B: reduce dose by 50%; Child-Pugh Class C: avoid use. |
| Pediatric use | 6-12 years: 10-30 mg once daily; 13-17 years: 10-40 mg once daily; start at 10 mg, increase weekly by 5-10 mg. |
| Geriatric use | Use lowest effective dose; start at 10 mg once daily, titrate slowly; monitor for hypertension, tachycardia, and agitation. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for ADDERALL XR 25 (ADDERALL XR 25).
| Breastfeeding | Excretion into breast milk is unknown; M/P ratio not established. Potential for infant stimulation and appetite suppression. Manufacturer recommends avoiding breastfeeding due to risks of amphetamine exposure. |
| Teratogenic Risk | First trimester: Limited human data; animal studies show increased risk of cardiovascular malformations at high doses. Second/third trimester: Potential for preterm birth, low birth weight, and neonatal withdrawal syndrome (irritability, dysphoria, tremors). Overall risk-benefit must consider maternal ADHD severity. |
■ FDA Black Box Warning
WARNING: ABUSE AND DEPENDENCE. CNS stimulants, including Adderall XR, have a high potential for abuse and dependence. Assess the risk of abuse prior to prescribing and monitor for signs of abuse and dependence while on therapy.
| Serious Effects |
["Advanced arteriosclerosis","Symptomatic cardiovascular disease","Moderate to severe hypertension","Hyperthyroidism","Known hypersensitivity or idiosyncrasy to sympathomimetic amines","Glaucoma","Agitated states","History of drug abuse","During or within 14 days of MAO inhibitor use (hypertensive crisis risk)"]
| Precautions | ["Serious cardiovascular events: Sudden death, stroke, and myocardial infarction have been reported in patients with structural cardiac abnormalities or other serious heart problems.","Blood pressure and heart rate increase: Monitor for hypertension and tachycardia.","Psychiatric adverse events: Exacerbation of pre-existing psychosis, mania, or aggression, and new-onset psychotic or manic symptoms.","Seizures: May lower seizure threshold; use with caution in patients with seizure history.","Peripheral vasculopathy: Raynaud's phenomenon may occur.","Serotonin syndrome: Risk when co-administered with serotonergic drugs.","Long-term suppression of growth: Monitor height and weight in pediatric patients."] |
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| Fetal Monitoring |
| Maternal: Blood pressure, heart rate, weight, and symptoms of stimulant toxicity. Fetal: Growth monitoring via ultrasound, assessment for signs of preterm labor after 20 weeks. |
| Fertility Effects | May impair fertility in females (anovulation, irregular cycles) and males (sperm motility/function). Effects are reversible upon discontinuation. |
| Food/Dietary | Acidic foods (e.g., citrus fruits, juices, soda, vitamin C) may decrease amphetamine absorption; high-fat meals may delay onset but do not affect overall absorption. Avoid excessive caffeine (coffee, tea, energy drinks) as it can potentiate CNS stimulation and cardiovascular effects. Alcohol should be avoided as it may increase rate of absorption and risk of overdose. |
| Clinical Pearls | ADDERALL XR 25 contains mixed amphetamine salts (MAS) in a 3:1 ratio of dextroamphetamine to levoamphetamine. The XR formulation utilizes a bimodal release system: immediate-release beads provide rapid onset within 1-2 hours, while delayed-release beads sustain therapeutic effect for 10-12 hours. Avoid splitting or crushing capsules as it disrupts the delivery mechanism. Monitor for cardiovascular effects: check BP and HR at baseline and follow-up; caution in patients with structural cardiac abnormalities. Abuse potential is high; schedule II controlled substance. Consider drug holidays to assess ongoing need and reduce tolerance. |
| Patient Advice | Take ADDERALL XR exactly as prescribed, usually once daily in the morning with or without food. · Swallow the capsule whole; do not crush, chew, or split it. If swallowing is difficult, you may open the capsule and sprinkle the beads onto a spoonful of applesauce; take immediately without chewing. · Avoid taking ADDERALL XR in the afternoon or evening as it may cause insomnia. · Do not stop abruptly without consulting your doctor; discontinuing may cause withdrawal symptoms such as severe fatigue, depression, or sleep disturbances. · Inform your doctor of any history of heart problems, high blood pressure, seizures, thyroid disease, glaucoma, or substance abuse. · Report any symptoms like chest pain, shortness of breath, fainting, or psychotic changes (e.g., hallucinations, aggression) immediately. · Limit or avoid alcohol and caffeine, as they can worsen side effects like nervousness, insomnia, and increased heart rate. · Store at room temperature away from moisture and heat. |