ATRIDOX
Clinical safety rating: caution
Comprehensive clinical and safety monograph for ATRIDOX (ATRIDOX).
ATRIDOX (doxycycline hyclate) is a tetracycline antibiotic that inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit, preventing aminoacyl-tRNA from binding to the A site. It also exhibits anti-inflammatory effects by inhibiting matrix metalloproteinases (MMPs) and reducing cytokine production.
| Metabolism | Doxycycline is metabolized primarily in the liver via glucuronidation, with minor involvement of cytochrome P450 enzymes. It undergoes enterohepatic recirculation and is excreted in feces and urine. |
| Excretion | Primarily renal (60-70% unchanged), biliary/fecal (10-15%) as active drug and metabolites; remainder metabolized. |
| Half-life | Terminal half-life 16-18 hours; prolonged to 24-48 hours in renal impairment, requiring dose adjustment. |
| Protein binding | 60-75% bound primarily to serum proteins (albumin). |
| Volume of Distribution | 0.4-0.6 L/kg; indicates moderate tissue distribution with accumulation in crevicular fluid. |
| Bioavailability | Local subgingival delivery: 100% bioavailable at site of action; negligible systemic absorption (<0.2 µg/mL plasma). |
| Onset of Action | Local subgingival: clinical improvement noted within 3-7 days; systemic: not applicable (local delivery only). |
| Duration of Action | Sustained release over 7-10 days from polymer formulation; clinical effects persist up to 3-6 months post-treatment. |
| Molecular Weight | 444.43 |
50 mg subgingival controlled-release insert applied by dental professional into periodontal pockets once every 3 months.
| Dosage form | SYSTEM, EXTENDED RELEASE |
| Renal impairment | No adjustment required for any degree of renal impairment. |
| Liver impairment | No adjustment required for any degree of hepatic impairment. |
| Pediatric use | Not recommended for use in pediatric patients due to lack of safety and efficacy data. |
| Geriatric use | No specific dose adjustment required; use same as adult dosing. |
| 1st trimester | Contraindicated: Doxycycline can cause fetal harm, including skeletal and teeth abnormalities (hypoplasia, discoloration) and retarded skeletal growth. Avoid in first trimester unless no alternatives. |
| 2nd trimester | Fetal risk: Doxycycline crosses placenta and may cause permanent tooth discoloration and enamel hypoplasia if used during tooth development (second and third trimesters). Use only if clearly needed. |
| 3rd trimester | Fetal risk: Same as second trimester. Avoid near term as theoretical risk of hepatic necrosis in mother. |
Clinical note
Comprehensive clinical and safety monograph for ATRIDOX (ATRIDOX).
| Placental transfer | Crosses placenta: Highly lipid-soluble, reaches fetal serum concentrations 20-60% of maternal levels. Binds to fetal bones and teeth. |
| Breastfeeding | Doxycycline is excreted into breast milk in small amounts. The American Academy of Pediatrics considers doxycycline compatible with breastfeeding. However, theoretical risk of dental staining and bone growth suppression in the infant exists. Avoid prolonged use; short-term use is likely safe. Monitor infant for gastrointestinal upset, rash, or candidiasis. |
■ FDA Black Box Warning
No FDA black box warning exists for ATRIDOX.
| Serious Effects |
Hypersensitivity to doxycycline or any other tetracyclinePregnancy (second and third trimesters) due to fetal tooth discoloration and bone growth retardationChildren under 8 years of age (except for anthrax or rickettsial infections) because of dental discoloration and enamel hypoplasiaLactation (prolonged or repeated use) due to risk of dental staining and bone development issues
| Precautions | Photosensitivity: patients may experience exaggerated sunburn reactions., Tooth discoloration and enamel hypoplasia if used during tooth development (pregnancy, infancy, childhood up to 8 years)., Superinfection: overgrowth of nonsusceptible organisms, including fungi., Esophageal injury: tablets can cause esophageal ulceration if not taken with adequate fluid., Intracranial hypertension: may cause pseudotumor cerebri. |
| Food/Dietary | No specific dietary restrictions. Avoid excessive consumption of calcium-rich foods (milk, yogurt, cheese) or dairy products within 2 hours of doxycycline administration as they can reduce absorption; but for ATRIDOX, which is applied subgingivally, systemic absorption is minimal and dietary interactions are negligible. However, to minimize potential systemic effects, avoid high-tyramine foods (aged cheese, cured meats) if patient is also taking MAOIs, though not specifically contraindicated. |
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| Lactation Rating | L2 (Safely Compatible - Short-term use only) |
| Teratogenic Risk | FDA Pregnancy Category D. First trimester: Doxycycline (active component) crosses placenta. Risk of fetal harm including skeletal retardation, reduced bone growth, and dental discoloration. Second/Third trimester: Risk of permanent tooth discoloration (yellow-gray-brown) and enamel hypoplasia due to calcium chelation. Use only if benefit outweighs risk; alternative agents preferred. |
| Fetal Monitoring | Monitor for signs of hepatotoxicity (elevated liver enzymes) and pancreatitis in pregnant women. Perform fetal ultrasound to assess bone growth if prolonged use. Monitor for maternal renal function if concurrent nephrotoxic drugs. No specific fetal monitoring required. |
| Fertility Effects | Animal studies show doxycycline may impair fertility by reducing sperm motility and count in males; reversible upon discontinuation. In females, no significant effect on fertility reported. Human data limited. |
| Clinical Pearls | ATRIDOX (doxycycline hyclate) is a subgingival controlled-release formulation of doxycycline, a tetracycline antibiotic, indicated for the treatment of chronic periodontitis as an adjunct to scaling and root planing (SRP). It is placed into periodontal pockets (≥5 mm) and provides sustained release of doxycycline over 7 days. Avoid concurrent use with systemic antibiotics due to potential additive effects. Do not apply in patients with known hypersensitivity to tetracyclines. Monitor for localized tissue irritation or allergic reaction. Not for use in patients with severe renal impairment (eCrCl <30 mL/min). |
| Patient Advice | Do not brush, floss, or use mouthwash around the treated area for 7 days after application. · Avoid eating hard, crunchy, or sticky foods for 1 week to prevent dislodging the gel. · Avoid touching the treated area with tongue or fingers. · Report any signs of allergic reaction (rash, swelling, difficulty breathing) or severe pain. · Complete full course of treatment; do not skip follow-up visits. · Inform your dentist if you are pregnant, breastfeeding, or taking blood thinners. · May cause temporary tooth discoloration; avoid prolonged exposure to acidic foods. · Do not use other dental products (e.g., Listerine) without consulting dentist. |