Risedronate
Generic Name: Risedronate Sodium
Brand Names: Actonel, Atelvia
Risedronate is an oral bisphosphonate for osteoporosis and Paget's disease, available in daily, weekly, or monthly dosing.
Drug Class
Bisphosphonate (Nitrogen-Containing, Pyridinyl)
Pregnancy
Category C; no adequate studies in pregnant women. Animal studies showed decreased survival and body weight of neonates at doses producing maternal hypocalcemia. Should not be used during pregnancy due to potential risk to the developing skeleton.
Available Forms
5 mg oral tablet (daily), 30 mg oral tablet (for Paget disease), 35 mg oral tablet (weekly), 35 mg delayed-release tablet (Atelvia, weekly, taken after breakfast), 150 mg oral tablet (monthly)
What It's Used For
Dosage Quick Reference
These are general dosage guidelines. Your doctor will determine the appropriate dose for your specific situation.
| Condition | Starting Dose | Maintenance Dose |
|---|---|---|
| Postmenopausal Osteoporosis (treatment/prevention) | 5 mg daily, 35 mg weekly, or 150 mg monthly | Same; reassess need after 3-5 years |
| Glucocorticoid-Induced Osteoporosis | 5 mg daily | 5 mg daily for the duration of glucocorticoid treatment |
| Paget Disease of Bone | 30 mg daily for 2 months | Re-treatment may be considered after at least 2-month post-treatment observation if relapse occurs |
Side Effects
Common Side Effects:
- Abdominal pain
- Dyspepsia
- Nausea
- Diarrhea
- Constipation
- Headache
- Arthralgia
Serious Side Effects:
- Esophageal ulcers/erosions
- Osteonecrosis of the jaw
- Atypical femur fractures
- Severe musculoskeletal pain
- Hypocalcemia
Drug Interactions
- Calcium supplements, antacids, and mineral supplements (calcium, magnesium, iron, aluminum): These polyvalent cations significantly reduce risedronate absorption. Take risedronate at least 30 minutes before (or at a different time than) calcium or antacid products.
- Proton pump inhibitors (omeprazole, pantoprazole): Long-term PPI use may reduce calcium absorption and has been independently associated with fracture risk. Combined use with bisphosphonates may warrant closer bone density monitoring.
- NSAIDs (ibuprofen, naproxen, aspirin): Both bisphosphonates and NSAIDs can irritate the GI tract. Concurrent use may increase the risk of esophageal erosion, gastric ulcers, or GI bleeding. Use the lowest effective NSAID dose.
- Aminoglycoside antibiotics (gentamicin): Both agents can lower serum calcium. Monitor calcium levels if concurrent use is necessary.
Additional Information
Risedronate is a nitrogen-containing bisphosphonate used to prevent and treat osteoporosis, Paget's disease of bone, and glucocorticoid-induced osteoporosis. It reduces bone resorption and fracture risk.
Mechanism of Action
Risedronate inhibits osteoclast-mediated bone resorption:
- Binds to hydroxyapatite: Concentrates at sites of active bone remodeling
- Inhibits farnesyl pyrophosphate synthase: Key enzyme in the mevalonate pathway
- Disrupts osteoclast function: Prevents prenylation of small GTPases essential for osteoclast activity
- Induces osteoclast apoptosis: Leads to reduced bone resorption
- Improves bone mineral density: Results in decreased fracture risk
Effects persist for months to years after discontinuation due to incorporation into bone matrix.
Available Formulations
- Immediate-release tablets: 5 mg (daily), 30 mg (Paget's), 35 mg (weekly), 150 mg (monthly)
- Delayed-release tablets: 35 mg (weekly, taken immediately after breakfast)
Medical Uses
FDA-Approved Indications:
- Prevention and treatment of postmenopausal osteoporosis
- Treatment to increase bone mass in men with osteoporosis
- Prevention and treatment of glucocorticoid-induced osteoporosis
- Paget's disease of bone
Dosing Guidelines
Postmenopausal Osteoporosis:
- 5 mg daily, OR
- 35 mg weekly, OR
- 150 mg monthly
- Delayed-release: 35 mg weekly immediately after breakfast
Osteoporosis in Men:
- 35 mg weekly
Glucocorticoid-Induced Osteoporosis:
- 5 mg daily
Paget's Disease:
- 30 mg daily for 2 months
- Retreatment may be considered after 2-month observation period if needed
Important Safety Information
Contraindications:
- Hypocalcemia
- Inability to sit or stand upright for at least 30 minutes
- Esophageal abnormalities that delay emptying (stricture, achalasia)
- Known hypersensitivity to risedronate
Warnings and Precautions:
- Esophageal adverse reactions: Esophagitis, esophageal ulcers, strictures
- Osteonecrosis of the jaw: Associated with bisphosphonate use
- Atypical femur fractures: Low-energy subtrochanteric and diaphyseal fractures
- Severe bone, joint, or muscle pain: May occur at any time during treatment
- Hypocalcemia: Correct before initiating; supplement with calcium and vitamin D
Drug Interactions
- Calcium supplements, antacids, oral medications with divalent cations: Impair absorption; separate by at least 30 minutes
- PPIs, H2 antagonists: May reduce absorption of delayed-release formulation (take with food)
- NSAIDs: May increase GI adverse effects
Administration Instructions
Immediate-Release:
- Take first thing in the morning on empty stomach with 6-8 oz plain water
- Remain upright (sitting or standing) for at least 30 minutes
- Wait at least 30 minutes before eating, drinking, or taking other medications
Delayed-Release:
- Take immediately after breakfast with at least 4 oz plain water
- Remain upright for at least 30 minutes
- Do not take on an empty stomach
Special Populations
- Renal Impairment: Not recommended if CrCl <30 mL/min
- Hepatic Impairment: No adjustment needed
- Pregnancy: Not recommended
- Lactation: Not recommended
- Pediatric: Not approved for children
Frequently Asked Questions
Questions to Ask Your Doctor
Consider discussing these topics at your next appointment:
- ✓Have my vitamin D levels been checked and optimized before starting risedronate?
- ✓Should I take the weekly or monthly formulation for better adherence?
- ✓After how many years should we discuss a bisphosphonate holiday?
- ✓Do I need a baseline DXA scan, and how often should it be repeated?
- ✓Should I complete any dental procedures before starting this medication?
Related Health Conditions
This medication is commonly used to treat or manage the following conditions:
Medical Disclaimer: This information is for educational purposes only and should not be considered medical advice. Always consult with your healthcare provider before starting, stopping, or changing any medication. Your doctor can provide personalized recommendations based on your specific health condition and medical history.
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Questions About This Medication?
Talk to your doctor or pharmacist about whether Risedronate is right for you.
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