Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
CEQUA vs AZATHIOPRINE SODIUM
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
Immunosuppressant; binds to cyclophilin D in mitochondria, inhibiting opening of mitochondrial permeability transition pore (m PTP), which reduces T-lymphocyte activation and cytokine release. Also forms complex with cyclophilin A to inhibit calcineurin, suppressing IL-2 production and T-cell proliferation.
Azathioprine is a prodrug of 6-mercaptopurine. It inhibits purine synthesis by interfering with the synthesis of DNA, RNA, and cellular proteins, thereby suppressing immune responses.
Dry eye disease due to keratoconjunctivitis sicca (KCS),Post-keratoplasty dry eye,Dry eye in Sjögren's syndrome
Renal transplantation (adjunctive immunosuppression),Rheumatoid arthritis (active, severe, not responsive to conventional therapy),Off-label: Inflammatory bowel disease (Crohn's disease, ulcerative colitis), autoimmune hepatitis, systemic lupus erythematosus, vasculitis, myasthenia gravis, pemphigus vulgaris
Instill one drop of 0.09% ophthalmic solution in each eye twice daily, approximately 12 hours apart.
1-2 mg/kg/day IV or oral, initially; maintenance 0.5-1 mg/kg/day IV or oral. For severe organ rejection: 3-5 mg/kg/day IV.
Terminal elimination half-life is approximately 8.4 hours (range 6-10 hours) in healthy adults; prolonged in hepatic impairment and pediatric patients.
Terminal elimination half-life of azathioprine is approximately 3-5 hours; its active metabolite 6-mercaptopurine has a half-life of 0.5-1.5 hours. However, the pharmacodynamic effect (immunosuppression) persists longer due to intracellular accumulation of thioguanine nucleotides.
Hepatic via CYP3A4 and CYP3A5; also undergoes fecal elimination with enterohepatic recirculation.
Primarily metabolized by xanthine oxidase (XO) and thiopurine methyltransferase (TPMT) to active and inactive metabolites. Also metabolized by aldehyde oxidase and glutathione S-transferase. Concomitant use with allopurinol (XO inhibitor) requires dose reduction.
Primarily fecal (90%) with minor renal excretion (<1% unchanged drug). Biliary excretion is the major route for elimination of cyclosporine metabolites.
Primarily renal: approximately 50% as unchanged drug and metabolites (6-mercaptopurine, thiouric acid) within 24 hours. Biliary/fecal excretion accounts for minor fraction (<5%).
90-98% bound primarily to lipoproteins (HDL, LDL) and to a lesser extent albumin and globulins.
Approximately 30% bound to serum proteins, primarily albumin.
4-8 L/kg, indicating extensive distribution into tissues (e.g., fat, liver, kidneys).
Apparent volume of distribution is 0.6-1.0 L/kg, indicating distribution into total body water and tissues.
Ophthalmic emulsion: systemic bioavailability is negligible (<0.1%) due to low absorption from the eye.
Oral bioavailability of azathioprine is approximately 60-70% (range 27-82%) due to first-pass metabolism. Intravenous administration yields 100% bioavailability.
No dosage adjustment required for renal impairment.
GFR 50-80 m L/min: no adjustment. GFR 30-50 m L/min: reduce dose by 25% to 50%. GFR 10-30 m L/min: reduce dose by 50% to 75%. GFR <10 m L/min: avoid or use with extreme caution.
No dosage adjustment required for hepatic impairment.
Child-Pugh class A: no adjustment. Child-Pugh class B: reduce dose by 50%. Child-Pugh class C: avoid use.
Safety and efficacy in pediatric patients have not been established.
2-5 mg/kg/day IV or oral, divided every 12-24 hours; dose based on body weight (mg/kg).
No specific dosage adjustment recommended; use with caution due to potential for increased systemic exposure.
Start at lower end of dosing range; monitor renal function and adjust accordingly. Consider reduced initial dose (e.g., 1 mg/kg/day) due to age-related decreased renal function.
Increased risk of infection and lymphoproliferative disorders including post-transplant lymphoproliferative disorder (PTLD).
MALIGNANCY: Immunosuppression increases risk of lymphoma and other malignancies, particularly skin cancers. Monitor for neoplasia, especially in renal transplant patients.
Increased susceptibility to infections,Potential for lymphoproliferative disorders and other malignancies,May cause renal impairment, hypertension, hyperkalemia, and hyperuricemia,Monitor blood cyclosporine levels to avoid toxicity,Avoid concurrent use of live vaccines,Caution with other nephrotoxic drugs
Hematotoxicity (leukopenia, thrombocytopenia, anemia) - monitor CBC. Hepatotoxicity - monitor liver function tests. Increased infection risk. Pancreatitis. Hypersensitivity reactions. Increased risk of malignancy (skin cancer, lymphoma). Use with caution in renal/hepatic impairment. Test for TPMT deficiency before use.
Hypersensitivity to cyclosporine or any component,Uncontrolled hypertension,Severe renal impairment (except in transplant setting),Active infections,Concurrent use with PUVA or UVB therapy
Hypersensitivity to azathioprine or 6-mercaptopurine. Severe active infection. Pregnancy (FDA Category D), especially first trimester. Lactation. Concomitant use with allopurinol (unless dose adjusted). TPMT deficiency (increased risk of severe myelotoxicity).
No significant food interactions reported for ophthalmic cyclosporine. However, patients should avoid touching the dropper tip to food surfaces. No dietary restrictions are necessary.
Avoid raw or undercooked meats and fish to reduce infection risk; no specific dietary restrictions; grapefruit juice has no known interaction.
CEQUA (cyclosporine ophthalmic solution) is classified as Pregnancy Category C. Animal studies have shown embryotoxic and fetotoxic effects at doses 0.2-0.8 times the human ocular dose. There are no adequate and well-controlled studies in pregnant women. Use only if potential benefit justifies potential risk to the fetus. First trimester: limited data, theoretical risk of immunosuppression. Second and third trimesters: no specific human data, but systemic cyclosporine is associated with increased risk of prematurity and low birth weight.
FDA Category D. Hematologic toxicity and immunosuppression in the neonate. Increased risk of congenital malformations (cleft palate, skeletal anomalies) and fetal growth restriction. First trimester exposure associated with highest risk; second and third trimester risks include intrauterine growth restriction and preterm birth.
Systemic cyclosporine is excreted in human milk. The M/P ratio is approximately 0.3-0.6. However, CEQUA is an ophthalmic formulation with minimal systemic absorption. Unknown whether topically applied cyclosporine is excreted in milk. Use caution, considering the importance of the drug to the mother. Breastfeeding infants should be monitored for potential adverse effects such as immune suppression.
Contraindicated during breastfeeding due to potential immunosuppression and hematologic toxicity in the nursing infant. M/P ratio: Not established.
No specific dosing adjustments are recommended for CEQUA in pregnancy due to its local administration and minimal systemic absorption. Pharmacokinetic changes in pregnancy (e.g., increased volume of distribution, altered protein binding) are unlikely to affect ophthalmic drug levels. No dose adjustment required.
Azathioprine dose may need to be reduced due to increased clearance in pregnancy; monitor 6-thioguanine nucleotide levels. Empiric dose adjustments not standardized; titrate to maintain therapeutic effect while minimizing myelotoxicity.
CEQUA (cyclosporine ophthalmic solution 0.09%) is a calcineurin inhibitor immunosuppressant indicated for keratoconjunctivitis sicca (dry eye disease). It increases tear production by inhibiting T-cell activation. Important: CEQUA requires no refrigeration (unlike Restasis), and the vehicle contains no preservatives. Use with caution in patients with active ocular infections; do not administer while wearing contact lenses. Onset of effect may take 2-4 weeks; maximum benefit may require 6 months. Contraindicated in patients with known hypersensitivity to cyclosporine.
Monitor CBC and LFTs weekly for first month, then biweekly for next 2 months, then monthly; dose reduction required with allopurinol coadministration (reduce to 25% of usual dose); screen for TPMT and NUDT15 deficiency before initiating therapy; avoid live vaccines; increased risk of lymphoproliferative disorders; use sun protection due to photosensitivity; pregnancy category D.
CEQUA is a prescription eye drop used to increase tear production in dry eye disease.,Instill one drop in each eye twice daily, about 12 hours apart.,Remove contact lenses before use; wait at least 15 minutes before reinserting.,Do not touch the dropper tip to any surface to avoid contamination.,CEQUA comes in a single-use vial; use immediately after opening and discard any remaining solution.,Temporary blurred vision may occur after instillation; wait until vision clears before driving.,Report any eye pain, vision changes, or signs of infection (redness, discharge) to your doctor.,Store CEQUA at room temperature (20-25°C); do not refrigerate or freeze.,It may take several weeks to notice improvement; continue use as prescribed even if you feel no effect initially.
Take exactly as prescribed, do not stop without consulting your doctor.,Report any signs of infection (fever, sore throat, easy bruising or bleeding) immediately.,Use effective contraception during treatment and for at least 3 months after stopping.,Avoid live vaccines (e.g., MMR, varicella, nasal flu) while on this medication.,Limit sun exposure and use broad-spectrum sunscreen and protective clothing.,Do not take allopurinol without your doctor's knowledge.,Attend all scheduled blood tests to monitor for side effects.,May cause nausea; take with food if upset stomach occurs.
No interactions on record
"Azathioprine may reduce the therapeutic efficacy and cardiotoxic effects of digitoxin by accelerating its metabolism through induction of cytochrome P450 enzymes, particularly CYP3A4. This interaction can lead to decreased digitoxin serum concentrations, potentially resulting in loss of heart rate control in patients with atrial fibrillation or heart failure. Conversely, the cardiotoxic risk of digitoxin is diminished, but the therapeutic goal may be compromised."
"Azathioprine and fingolimod both suppress lymphocyte function, leading to additive or synergistic immunosuppression. This combination increases the risk of severe infections, including opportunistic infections, due to profound immune system suppression. Clinically, patients may present with prolonged lymphopenia, increased susceptibility to infections, and potential reactivation of latent viruses such as JC virus (causing progressive multifocal leukoencephalopathy) or cytomegalovirus."
"Azathioprine, an immunosuppressant that acts as a prodrug for 6-mercaptopurine, can increase the myelosuppressive effects of benazepril, an ACE inhibitor. This interaction is likely due to additive bone marrow suppression, leading to an elevated risk of leukopenia, anemia, and thrombocytopenia, especially in patients with renal impairment or concomitant use of other myelosuppressive agents."
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about CEQUA vs AZATHIOPRINE SODIUM, answered by our medical review team.
CEQUA is a Immunosuppressant that works by Immunosuppressant; binds to cyclophilin D in mitochondria, inhibiting opening of mitochondrial permeability transition pore (m PTP), which reduces T-lymphocyte activation and cytokine release. Also forms complex with cyclophilin A to inhibit calcineurin, suppressing IL-2 production and T-cell proliferation.. AZATHIOPRINE SODIUM is a Immunosuppressant that works by Azathioprine is a prodrug of 6-mercaptopurine. It inhibits purine synthesis by interfering with the synthesis of DNA, RNA, and cellular proteins, thereby suppressing immune responses.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between CEQUA and AZATHIOPRINE SODIUM depend on the specific clinical indication. These are both Immunosuppressant agents and are not directly interchangeable by dose. A physician or clinical pharmacist should guide any therapeutic switching decisions.
The standard adult dose of CEQUA is: Instill one drop of 0.09% ophthalmic solution in each eye twice daily, approximately 12 hours apart.. The standard adult dose of AZATHIOPRINE SODIUM is: 1-2 mg/kg/day IV or oral, initially; maintenance 0.5-1 mg/kg/day IV or oral. For severe organ rejection: 3-5 mg/kg/day IV.. 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 CEQUA and AZATHIOPRINE SODIUM 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. CEQUA is classified as Category C. CEQUA (cyclosporine ophthalmic solution) is classified as Pregnancy Category C. Animal studies have shown embryotoxic and fetotoxic effects at doses 0.2-0.8 times the human ocular . AZATHIOPRINE SODIUM is classified as Category D/X. FDA Category D. Hematologic toxicity and immunosuppression in the neonate. Increased risk of congenital malformations (cleft palate, skeletal anomalies) and fetal growth restrictio. Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.