Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
ACTIQ vs ATELVIA
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
Opioid agonist; binds to mu-opioid receptors in the CNS, altering pain perception and response.
Risedronate (the active ingredient in ATELVIA) inhibits osteoclast-mediated bone resorption by binding to hydroxyapatite in bone and inhibiting the mevalonate pathway, which prevents farnesyl pyrophosphate synthase activity, leading to disruption of osteoclast function and induction of apoptosis.
Management of breakthrough pain in cancer patients aged 16 and older who are already receiving and tolerant to opioid therapy for their underlying persistent cancer pain
Treatment of osteoporosis in postmenopausal women,Treatment of osteoporosis in men at high risk of fracture,Treatment and prevention of glucocorticoid-induced osteoporosis,Off-label: Paget's disease of bone
200 mcg transmucosally, titrated upward as needed; initial dose for opioid-tolerant patients is 200 mcg, with additional doses possible after 15 minutes if needed. Maximum 4 doses per episode. At least 4 hours between episodes.
35 mg orally once weekly on the same day each week, taken with at least 240 m L of plain water at least 30 minutes before the first food, beverage, or medication of the day. Do not crush, chew, or suck tablets.
Terminal half-life 0.83–2 hours (mean 1.3 h) in adults; note that context: transmucosal absorption leads to rapid onset but short duration; half-life is not correlated with clinical effect due to oral transmucosal route and rapid redistribution.
Terminal elimination half-life is approximately 10 days due to prolonged bone binding and slow release; clinical suppression of bone resorption persists for weeks after discontinuation.
Primarily hepatic via CYP3A4 to inactive metabolites (norfentanyl, despropionylfentanyl, hydroxyfentanyl) and other metabolites; <7% excreted unchanged in urine.
Risedronate is not metabolized and is excreted unchanged primarily by the kidneys (<5% metabolized). No cytochrome P450 enzymes involved.
Primarily renal as metabolites (about 75% as metabolites, <10% unchanged). Fecal excretion accounts for <9%. Biliary excretion is minor.
Approximately 50% of absorbed dose excreted renally unchanged; remainder eliminated via biliary/fecal routes. Renal clearance correlates with creatinine clearance.
Fentanyl is 80–85% bound to plasma proteins (primarily albumin and α1-acid glycoprotein).
Approximately 99% bound to plasma proteins, primarily albumin.
Approximately 4 L/kg (range 3–6 L/kg); large Vd indicates extensive tissue distribution and redistribution contributing to short duration.
Mean Vd is 6.2 L/kg (range 4-10 L/kg), indicating extensive distribution into bone and soft tissues.
Oral transmucosal: 50% (range 47–54%) relative to IV; variable and enhanced by rapid absorption through buccal mucosa.
Oral bioavailability is approximately 0.7% (range 0.5-1.0%) under fasting conditions; food and calcium-containing beverages significantly reduce absorption.
No specific GFR-based dose adjustment recommended; use with caution in severe renal impairment (Cr Cl < 30 m L/min) and consider dose reduction due to potential accumulation.
Contraindicated in patients with Cr Cl <15 m L/min. No dose adjustment required for Cr Cl ≥15 m L/min. For Cr Cl 15-30 m L/min, use with caution due to limited data.
Child-Pugh Class A/B: No adjustment. Child-Pugh Class C: Reduce initial dose to 100 mcg and titrate slowly; monitor closely for prolonged effects.
No dose adjustment required for mild to moderate hepatic impairment (Child-Pugh A or B). Not studied in severe hepatic impairment (Child-Pugh C); use caution.
Not approved for pediatric use; safety and efficacy not established in patients under 16 years.
Not approved for use in pediatric patients; safety and efficacy not established in children.
Initiate at 100 mcg transmucosally; titrate slowly due to increased sensitivity and risk of respiratory depression. Monitor for adverse effects.
No specific dose adjustment required. Consider potential renal impairment (assess Cr Cl) and increased risk of gastrointestinal adverse effects. Ensure adequate calcium and vitamin D intake.
Risk of respiratory depression, addiction, abuse, and misuse; accidental ingestion can be fatal; concomitant use with benzodiazepines or CNS depressants may cause profound sedation, respiratory depression, coma, and death; not for use in opioid non-tolerant patients; risk of neonatal opioid withdrawal syndrome with prolonged use during pregnancy; serious, life-threatening, or fatal respiratory depression may occur even at recommended doses.
No FDA black box warning.
Risk of respiratory depression; addiction, abuse, and misuse; interactions with CNS depressants; serotonin syndrome; adrenal insufficiency; severe hypotension; seizures; withdrawal; use in patients with head injuries, increased intracranial pressure, biliary tract disease, pancreatitis; risk of choking with lozenge; oral mucosal irritation; dental caries; hypokalemia; hyponatremia; use in elderly, cachectic, or debilitated patients.
Hypocalcemia must be corrected before therapy initiation,Severe renal impairment (Cr Cl <30 m L/min): not recommended,Osteonecrosis of the jaw (ONJ) with invasive dental procedures,Atypical femur fractures with long-term use,Upper gastrointestinal adverse events (e.g., esophagitis, ulcers) if taken incorrectly,Hypersensitivity reactions including angioedema
Significant respiratory depression; acute or severe bronchial asthma in an unmonitored setting or without resuscitative equipment; known or suspected paralytic ileus; hypersensitivity to fentanyl or any component; opioid non-tolerant patients; management of acute or postoperative pain including headache/migraine, dental pain, or emergency department use.
Hypocalcemia,Creatinine clearance <30 m L/min,Inability to stand or sit upright for at least 30 minutes,History of esophageal disorders (e.g., stricture, achalasia)
No significant food interactions. Grapefruit juice may increase fentanyl levels, but specific studies with ACTIQ are lacking. Avoid alcohol, as it may increase sedation and respiratory depression risk.
Food, beverages (except plain water), and calcium supplements reduce absorption. Avoid any food or drink for at least 30 minutes after dosing. Do not take with mineral water, coffee, tea, juice, or dairy products. Calcium, iron, magnesium, or aluminum-containing antacids should be taken at a different time of day.
FDA Pregnancy Category C. First trimester: limited human data; animal studies show increased resorptions and fetal growth restriction. Second/third trimester: chronic use may cause neonatal opioid withdrawal syndrome; avoid use during labor due to risk of neonatal respiratory depression.
Category C: In animal studies, bisphosphonates cause fetal skeletal abnormalities at high doses. During first trimester, theoretical risk of skeletal formation interference. Second/third trimester: Potential for maternal hypocalcemia affecting fetal bone development. No adequate human studies. Risk cannot be excluded.
Excreted in breast milk; M/P ratio not established. Limited data suggest low levels, but risk of infant sedation and respiratory depression. Avoid use while breastfeeding unless potential benefit outweighs risk.
Unknown: Excretion in human milk is unknown but likely low due to high protein binding and short half-life. M/P ratio not established. Use with caution in breastfeeding due to potential for bone growth suppression in infants; alternatives preferred.
Due to increased plasma volume and hepatic metabolism in pregnancy, dose requirements may increase; adjust based on clinical response and tolerance. Avoid use during labor and delivery due to risk of neonatal respiratory depression; short-term use preferred.
No formal dose adjustments studied. Pregnancy may increase bone turnover and renal clearance, but data insufficient to recommend dose change. Use lowest effective dose only if clearly needed. Avoid during pregnancy unless benefit outweighs risk.
ACTIQ is a transmucosal immediate-release fentanyl formulation indicated for breakthrough cancer pain in opioid-tolerant patients. Initiate with the lowest strength (200 mcg) and titrate upward. Avoid use in opioid-naive patients due to risk of fatal respiratory depression. Place the unit between cheek and lower gum, not sublingually. Instruct patient not to bite or suck the unit. Monitor for sedation and respiratory depression. Multiple units may be used per episode if needed, but wait at least 4 hours before next episode. Dispose of partially used units by flushing down toilet.
ATELVIA (risedronate) is a bisphosphonate for osteoporosis. Must be taken on an empty stomach with plain water only, at least 30 minutes before first food, drink, or other medication. Avoid in severe renal impairment (Cr Cl <30 m L/min). Monitor for hypocalcemia before initiation. Advise patients to remain upright for 30 minutes post-dose to reduce esophageal irritation.
Only use ACTIQ if you are already taking regular around-the-clock opioid pain medicine and are tolerant to opioids.,Do not use ACTIQ for short-term pain like after surgery, headache, or dental pain.,Place the unit in your cheek pouch, not under your tongue. Do not chew or suck it.,If you need more than 4 units per day, contact your doctor as your dose may need adjustment.,Store ACTIQ in a safe place away from children, as accidental ingestion can be fatal.,Dispose of unused or partially used units by flushing them down the toilet.
Take ATELVIA first thing in the morning, at least 30 minutes before any food, drink, or other medications.,Swallow the tablet whole with a full glass (6-8 oz) of plain water only; do not use mineral water, coffee, tea, or juice.,Do not chew, crush, or suck the tablet; remain upright (sitting or standing) for at least 30 minutes after taking.,If you miss a dose, skip it and take the next dose the following morning; do not take two doses on the same day.,Report symptoms of esophageal irritation such as difficulty or pain with swallowing, chest pain, or heartburn.,Ensure adequate intake of calcium and vitamin D as directed by your healthcare provider.
No interactions on record
No interactions on record
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about ACTIQ vs ATELVIA, answered by our medical review team.
ACTIQ is a Opioid Analgesic that works by Opioid agonist; binds to mu-opioid receptors in the CNS, altering pain perception and response.. ATELVIA is a Bisphosphonate that works by Risedronate (the active ingredient in ATELVIA) inhibits osteoclast-mediated bone resorption by binding to hydroxyapatite in bone and inhibiting the mevalonate pathway, which prevents farnesyl pyrophosphate synthase activity, leading to disruption of osteoclast function and induction of apoptosis.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between ACTIQ and ATELVIA depend on the specific clinical indication. These are agents from distinct pharmacological classes and are not directly interchangeable by dose. A physician or clinical pharmacist should guide any therapeutic switching decisions.
The standard adult dose of ACTIQ is: 200 mcg transmucosally, titrated upward as needed; initial dose for opioid-tolerant patients is 200 mcg, with additional doses possible after 15 minutes if needed. Maximum 4 doses per episode. At least 4 hours between episodes.. The standard adult dose of ATELVIA is: 35 mg orally once weekly on the same day each week, taken with at least 240 m L of plain water at least 30 minutes before the first food, beverage, or medication of the day. Do not crush, chew, or suck tablets.. Dosing should always be individualized based on indication, renal and hepatic function, age, and other patient factors.
No direct drug-drug interaction has been formally documented between ACTIQ and ATELVIA in current clinical databases. However, individual patient risk factors including other medications, organ function, and comorbidities should always be evaluated by a qualified healthcare provider.
The maternal-fetal safety profiles differ. ACTIQ is classified as Category C. FDA Pregnancy Category C. First trimester: limited human data; animal studies show increased resorptions and fetal growth restriction. Second/third trimester: chronic use may cause. ATELVIA is classified as Category C. Category C: In animal studies, bisphosphonates cause fetal skeletal abnormalities at high doses. During first trimester, theoretical risk of skeletal formation interference. Second. Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.