Zidovudine, a component of lamivudine/zidovudine tablets, has been associated with hematologic toxicity, including neutropenia and severe anemia, particularly in patients with advanced HIV-1 disease.
Prolonged use of zidovudine has been associated with symptomatic myopathy.
Severe, acute exacerbations of hepatitis B have been reported in patients who are coinfected with hepatitis B virus (HBV) and HIV-1 and have discontinued lamivudine, a component of lamivudine/zidovudine. Hepatic function should be monitored closely with both clinical and laboratory follow-up for at least several months in patients who discontinue lamivudine/zidovudine and are coinfected with HIV-1 and HBV. If appropriate, initiation of antihepatitis B therapy may be warranted.
Lactic acidosis and severe hepatomegaly with steatosis, including fatal cases, have been reported with use of nucleoside analogues, including lamivudine and zidovudine. Discontinue lamivudine/zidovudine if clinical or laboratory findings suggestive of lactic acidosis or pronounced hepatotoxicity occur.
Note: Because this is a fixed-dose combination product, avoid use in patients requiring dosage reduction.
HIV-1 infection, treatment: Oral: One tablet (lamivudine 150 mg/zidovudine 300 mg) twice daily.
Dosage adjustment for concomitant therapy: Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.
CrCl ≥50 mL/minute: No dosage adjustment necessary.
CrCl <50 mL/minute: Use is not recommended (use dose-adjusted individual components).
Use is not recommended (use dose-adjusted individual components).
(For additional information see "Zidovudine and lamivudine: Pediatric drug information")
HIV-1 infection, treatment: Note: Use in combination with other antiretroviral (ARV) agents; evaluate gene mutation and ARV resistance patterns (refer to https://www.iasusa.org and https://hivdb.stanford.edu/ for more information).
Children and Adolescents weighing ≥30 kg: Lamivudine 150 mg and zidovudine 300 mg per tablet: Oral: One tablet twice daily.
Dosage adjustment for concomitant therapy: Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.
Children and Adolescents weighing ≥30 kg:
CrCl ≥50 mL/minute: No dosage adjustment necessary.
CrCl <50 mL/minute: Use of fixed-dose combination is not recommended; see individual agents.
Children and Adolescents weighing ≥30 kg: Use of fixed-dose combination is not recommended; see individual agents.
See individual agents.
Hypersensitivity to lamivudine or zidovudine, or any component of the formulation.
Canadian labeling: Additional contraindications (not in US labeling): Neutrophil count <750/mm3 or hemoglobin <7.5 g/dL (4.65 mmol/L)
Concerns related to adverse effects:
• Hematologic toxicity: [US Boxed Warning]: Zidovudine is associated with hematologic toxicity, including neutropenia and severe anemia. Use with caution in patients with bone marrow compromise (granulocytes <1,000 cells/mm3 or hemoglobin <9.5 g/dL).
• Immune reconstitution syndrome: Patients may develop immune reconstitution syndrome resulting in the occurrence of an inflammatory response to an indolent or residual opportunistic infection during initial HIV treatment or activation of autoimmune disorders (eg, Graves disease, polymyositis, Guillain-Barré syndrome) later in therapy; further evaluation and treatment may be required.
• Lactic acidosis/hepatomegaly: [US Boxed Warning]: Lactic acidosis and severe hepatomegaly with steatosis, including fatal cases, have been reported with the use of nucleoside analogues and other antiretrovirals. Female gender and obesity may increase the risk for development. Suspend treatment in any patient who develops clinical or laboratory findings suggestive of lactic acidosis or hepatotoxicity (transaminase elevation may/may not accompany hepatomegaly and steatosis).
• Lipoatrophy: Zidovudine may cause loss of subcutaneous fat, especially in the face, limbs, and buttocks. Lipoatrophy incidence and severity are related to cumulative exposure and may be only partially reversible; improvement may take months to years after switching to a regimen that does not contain zidovudine. Monitor patients for signs of lipoatrophy and consider switching to a non-zidovudine-containing regimen if lipoatrophy occurs.
• Myopathy: [US Boxed Warning]: Prolonged use of zidovudine has been associated with symptomatic myopathy.
Disease-related concerns:
• Chronic hepatitis B: [US Boxed Warning]: Severe acute exacerbations of hepatitis B have been reported in patients coinfected with HBV and HIV-1 when therapy is discontinued; monitor patients with clinical and laboratory follow-up for at least several months after treatment discontinuation. Emergence of hepatitis B virus lamivudine-resistant variants has been reported in patients with concurrent HBV infection who received a lamivudine-containing regimen for HIV-1 treatment.
• Hepatic impairment: Use is not recommended in patients with hepatic impairment.
• Pancreatitis: Use with caution in patients with a history of pancreatitis or other significant risk factors for pancreatitis development. Discontinue immediately if clinical signs, symptoms, or laboratory abnormalities suggestive of pancreatitis occur.
• Renal impairment: Use is not recommended in patients with renal impairment (CrCl <50 mL/minute).
The major clinical toxicity of lamivudine in pediatric patients is pancreatitis, which occurred in 14% of patients in one open-label, dose-escalation trial; discontinue lamivudine therapy if clinical signs, symptoms, or laboratory abnormalities suggestive of pancreatitis occur. Use with extreme caution and only if there is no satisfactory alternative therapy in pediatric patients with a history of pancreatitis or other significant risk factors for the development of pancreatitis (Epivir prescribing information 2020).
Zidovudine-related adverse hematologic effects may be concentration-dependent and associated with increasing AUC (Fillekes 2014; HHS [pediatric] 2023). Adverse cardiac effects have been associated with zidovudine therapy. A prospective study of 325 pediatric patients aged 7 to 16 years with perinatally acquired HIV evaluated associations between previous or current antiretroviral agents and cardiac echocardiogram measures. When comparing patients currently receiving zidovudine (n=107) with those who were not, zidovudine therapy was associated with increased end-systolic wall stress and slightly larger heart size. Longer duration of zidovudine use was associated with higher wall stress (Williams 2018). A descriptive study evaluated 643 individuals 1 to 25 years of age with perinatally acquired HIV to determine prevalence of early cardiac dysfunction and reported that left ventricular ejection fraction was negatively associated with history of zidovudine exposure. Implications for cardiac outcomes later in life (eg, cardiomyopathy) are unknown (McCrary 2020; Williams 2018).
Excipient information presented when available (limited, particularly for generics); consult specific product labeling. [DSC] = Discontinued product
Tablet, Oral:
Combivir: Lamivudine 150 mg and zidovudine 300 mg [DSC] [scored]
Generic: Lamivudine 150 mg and zidovudine 300 mg
Yes
Tablets (lamiVUDine-Zidovudine Oral)
150-300 mg (per each): $4.42 - $15.53
Disclaimer: A representative AWP (Average Wholesale Price) price or price range is provided as reference price only. A range is provided when more than one manufacturer's AWP price is available and uses the low and high price reported by the manufacturers to determine the range. The pricing data should be used for benchmarking purposes only, and as such should not be used alone to set or adjudicate any prices for reimbursement or purchasing functions or considered to be an exact price for a single product and/or manufacturer. Medi-Span expressly disclaims all warranties of any kind or nature, whether express or implied, and assumes no liability with respect to accuracy of price or price range data published in its solutions. In no event shall Medi-Span be liable for special, indirect, incidental, or consequential damages arising from use of price or price range data. Pricing data is updated monthly.
Excipient information presented when available (limited, particularly for generics); consult specific product labeling. [DSC] = Discontinued product
Tablet, Oral:
Combivir: Lamivudine 150 mg and zidovudine 300 mg [DSC] [contains polysorbate 80]
Generic: Lamivudine 150 mg and zidovudine 300 mg
Oral: Administer without regard to food.
Oral: May be administered without regard to meals
Zidovudine is a hazardous agent (NIOSH 2024 [table 2]).
Use appropriate precautions for receiving, handling, storage, preparation, dispensing, transporting, administration, and disposal. Follow NIOSH and USP 800 recommendations and institution-specific policies/procedures for appropriate containment strategy (NIOSH 2023; NIOSH 2024; USP-NF 2020).
Note: Facilities may perform risk assessment of some hazardous drugs to determine if appropriate for alternative handling and containment strategies (USP-NF 2020). Refer to institution-specific handling policies/procedures.
HIV-1 infection, treatment: Treatment of HIV-1 infection in combination with other antiretrovirals.
Combivir may be confused with Combivent, Epivir
AZT is an error-prone abbreviation (mistaken as azaTHIOprine, aztreonam)
Refer to individual components.
Note: Interacting drugs may not be individually listed below if they are part of a group interaction (eg, individual drugs within “CYP3A4 Inducers [Strong]” are NOT listed). For a complete list of drug interactions by individual drug name and detailed management recommendations, use the drug interactions program by clicking on the “Launch drug interactions program” link above.
5-Aminosalicylic Acid Derivatives: May increase myelosuppressive effects of Myelosuppressive Agents. Risk C: Monitor
Acemetacin: May increase adverse/toxic effects of Zidovudine. Specifically, the risk for hematologic toxicity may be increased. Risk C: Monitor
Amodiaquine: Zidovudine may increase neutropenic effects of Amodiaquine. Management: Avoid coadministration of zidovudine-containing antiretroviral therapy with amodiaquine when possible. If combined, monitor closely for neutropenia. Risk D: Consider Therapy Modification
Antithyroid Agents: Myelosuppressive Agents may increase neutropenic effects of Antithyroid Agents. Risk C: Monitor
Arimoclomol: May increase serum concentration of OCT2 Substrates (Clinically Relevant with Inhibitors). Risk C: Monitor
Atidarsagene Autotemcel: Antiretroviral Agents may decrease therapeutic effects of Atidarsagene Autotemcel. Risk X: Avoid
BCG (Intravesical): Myelosuppressive Agents may decrease therapeutic effects of BCG (Intravesical). Myelosuppressive Agents may increase adverse/toxic effects of BCG (Intravesical). Risk X: Avoid
Betibeglogene Autotemcel: Antiretroviral Agents may decrease therapeutic effects of Betibeglogene Autotemcel. Risk X: Avoid
Cabozantinib: MRP2 Inhibitors may increase serum concentration of Cabozantinib. Risk C: Monitor
Chloramphenicol (Ophthalmic): May increase adverse/toxic effects of Myelosuppressive Agents. Risk C: Monitor
Chloramphenicol (Systemic): Myelosuppressive Agents may increase myelosuppressive effects of Chloramphenicol (Systemic). Risk X: Avoid
Cladribine: Agents that Undergo Intracellular Phosphorylation may decrease therapeutic effects of Cladribine. Risk X: Avoid
Clarithromycin: May increase myelosuppressive effects of Zidovudine. Clarithromycin may decrease serum concentration of Zidovudine. Management: Monitor response to zidovudine closely when used with clarithromycin, and consider staggering zidovudine and clarithromycin doses when possible in order to minimize the potential for interaction. Risk D: Consider Therapy Modification
CloZAPine: Myelosuppressive Agents may increase adverse/toxic effects of CloZAPine. Specifically, the risk for neutropenia may be increased. Risk C: Monitor
Deferiprone: Myelosuppressive Agents may increase neutropenic effects of Deferiprone. Management: Avoid the concomitant use of deferiprone and myelosuppressive agents whenever possible. If this combination cannot be avoided, monitor the absolute neutrophil count more closely. Risk D: Consider Therapy Modification
Dexketoprofen: May increase adverse/toxic effects of Zidovudine. Risk C: Monitor
DOXOrubicin (Conventional): May decrease therapeutic effects of Zidovudine. DOXOrubicin (Conventional) may increase adverse/toxic effects of Zidovudine. Management: Avoid concomitant use of doxorubicin and zidovudine due to the possibility of reduced zidovudine efficacy and increased myelosuppressive effects. Risk D: Consider Therapy Modification
DOXOrubicin (Liposomal): May decrease therapeutic effects of Zidovudine. DOXOrubicin (Liposomal) may increase adverse/toxic effects of Zidovudine. Management: Avoid concomitant use of doxorubicin and zidovudine. Reduced efficacy of zidovudine is possible based on in vitro data. Also, increased myelosuppressive effects are possible with combined administration. Risk D: Consider Therapy Modification
Elivaldogene Autotemcel: Antiretroviral Agents may decrease therapeutic effects of Elivaldogene Autotemcel. Management: Avoid use of antiretroviral medications for at least one month, or for the amount of time required for elimination of the retroviral medication, prior to stem cell mobilization and until the all apheresis cycles are finished Risk X: Avoid
Fedratinib: May increase serum concentration of MATE1/2-K Substrates (Clinically Relevant with Inhibitors). Risk C: Monitor
Fedratinib: May increase serum concentration of OCT2 Substrates (Clinically Relevant with Inhibitors). Risk C: Monitor
Fexinidazole: Myelosuppressive Agents may increase myelosuppressive effects of Fexinidazole. Risk X: Avoid
Foslevodopa: May increase serum concentration of MATE1/2-K Substrates (Clinically Relevant with Inhibitors). Risk C: Monitor
Ganciclovir-Valganciclovir: May increase adverse/toxic effects of Zidovudine. Specifically, hematologic toxicity may be enhanced. Risk C: Monitor
Gilteritinib: May increase serum concentration of OCT1 Substrates (Clinically Relevant with Inhibitors). Risk C: Monitor
Givinostat: May increase serum concentration of OCT2 Substrates (Clinically Relevant with Inhibitors). Risk C: Monitor
Interferons: May increase adverse/toxic effects of Zidovudine. Interferons may decrease metabolism of Zidovudine. Risk C: Monitor
Levomethadone: May increase serum concentration of Zidovudine. Risk C: Monitor
Linezolid: May increase myelosuppressive effects of Myelosuppressive Agents. Risk C: Monitor
Lopinavir: May decrease serum concentration of Zidovudine. Risk C: Monitor
Lovotibeglogene Autotemcel: Antiretroviral Agents may decrease therapeutic effects of Lovotibeglogene Autotemcel. Risk X: Avoid
Methadone: May increase serum concentration of Zidovudine. Risk C: Monitor
Nelfinavir: May decrease serum concentration of Zidovudine. Risk C: Monitor
Nirmatrelvir and Ritonavir: May decrease serum concentration of Zidovudine. Risk C: Monitor
Olaparib: Myelosuppressive Agents may increase myelosuppressive effects of Olaparib. Risk C: Monitor
Orlistat: May decrease serum concentration of Antiretroviral Agents. Risk C: Monitor
Probenecid: May increase serum concentration of Zidovudine. Risk C: Monitor
Promazine: May increase myelosuppressive effects of Myelosuppressive Agents. Risk C: Monitor
Raltegravir: May increase myopathic (rhabdomyolysis) effects of Zidovudine. Risk C: Monitor
Ribavirin (Oral Inhalation): Zidovudine may increase adverse/toxic effects of Ribavirin (Oral Inhalation). Specifically, the risk/severity of anemia may be increased. Management: Due to significantly increased risk of anemia, consider even closer monitoring for anemia than routinely recommended. Alternative therapies should be considered when clinically possible, particularly for patients with other risk factors. Risk D: Consider Therapy Modification
Ribavirin (Systemic): Zidovudine may increase adverse/toxic effects of Ribavirin (Systemic). Specifically, the risk/severity of anemia may be increased. Management: Due to significantly increased risk of anemia, consider even closer monitoring for anemia than routinely recommended for ribavirin. Alternative therapies should be considered when clinically possible, particularly for patients with other risk factors. Risk D: Consider Therapy Modification
RifAMPin: May decrease serum concentration of Zidovudine. Risk C: Monitor
Risdiplam: May increase serum concentration of MATE1/2-K Substrates (Clinically Relevant with Inhibitors). Management: Avoid use of risdiplam with MATE substrates if possible. If the combination cannot be avoided, monitor closely for adverse effects. Consider a reduced dose of the MATE substrate according to that substrate's labeling if appropriate. Risk D: Consider Therapy Modification
Ritonavir: May decrease serum concentration of Zidovudine. Risk C: Monitor
Ropeginterferon Alfa-2b: Myelosuppressive Agents may increase myelosuppressive effects of Ropeginterferon Alfa-2b. Management: Avoid coadministration of ropeginterferon alfa-2b and other myelosuppressive agents. If this combination cannot be avoided, monitor patients for excessive myelosuppressive effects. Risk D: Consider Therapy Modification
Sorbitol: May decrease serum concentration of LamiVUDine. Management: When possible, avoid chronic coadministration of sorbitol-containing solutions with lamivudine, but if this combination cannot be avoided, monitor patients more closely for possible therapeutic failure associated with decreased lamivudine exposure. Risk D: Consider Therapy Modification
Stavudine: Zidovudine may decrease therapeutic effects of Stavudine. Risk X: Avoid
Tafenoquine: May increase serum concentration of MATE1/2-K Substrates (Clinically Relevant with Inhibitors). Management: Avoid use of MATE substrates with tafenoquine, and if the combination cannot be avoided, monitor closely for evidence of toxicity of the MATE substrate and consider a reduced dose of the MATE substrate according to that substrate's labeling. Risk D: Consider Therapy Modification
Tafenoquine: May increase serum concentration of OCT2 Substrates (Clinically Relevant with Inhibitors). Management: Avoid use of OCT2 substrates with tafenoquine, and if the combination cannot be avoided, monitor closely for evidence of toxicity of the OCT2 substrate and consider a reduced dose of the OCT2 substrate according to that substrate's labeling. Risk D: Consider Therapy Modification
Tenoxicam: May increase adverse/toxic effects of Zidovudine. Risk C: Monitor
Tipranavir: May decrease serum concentration of Zidovudine. Risk C: Monitor
Trimethoprim: May increase serum concentration of LamiVUDine. Risk C: Monitor
Trimethoprim: Zidovudine may increase neutropenic effects of Trimethoprim. Trimethoprim may increase serum concentration of Zidovudine. Risk C: Monitor
Valproic Acid and Derivatives: May increase serum concentration of Zidovudine. Risk C: Monitor
Vimseltinib: May increase serum concentration of OCT2 Substrates (Clinically Relevant with Inhibitors). Management: Avoid concomitant use of vimseltinib and OCT2 substrates when possible. If combined, monitor for increased effects and toxicities of the OCT2 substrate and consider dose adjustments. Risk D: Consider Therapy Modification
Lamivudine in combination with zidovudine is an alternative regimen for patients with HIV infection who are not yet pregnant but are trying to conceive (HHS [perinatal] 2024).
Refer to individual monographs for additional information.
Lamivudine in combination with zidovudine is an alternative NRTI backbone for pregnant patients with HIV infection who are antiretroviral-naive, who have had antiretroviral therapy (ART) in the past but are restarting, or who require a new ART regimen (due to poor tolerance or poor virologic response of current regimen). Patients who become pregnant while taking this combination may continue if viral suppression is effective and the regimen is well tolerated. Although use of this combination has significant experience for use in pregnancy, it has an increased potential for adverse events and requires twice-daily dosing (HHS [perinatal] 2024).
Refer to individual monographs for additional information.
Lamivudine and zidovudine are both present in breast milk.
Refer to individual monographs for additional information.
Amylase, bilirubin, signs and symptoms of pancreatitis. Monitor CBC with differential and platelet count at least every 2 weeks, liver function tests (including signs/symptoms of hepatomegaly), MCV, serum creatinine kinase, viral load, and CD4 count; observe for appearance of opportunistic infections; signs of muscle weakness or pain; blood lactate levels and signs of acidosis
The combination of zidovudine and lamivudine is believed to act synergistically to inhibit reverse transcriptase via DNA chain termination after incorporation of the nucleoside analogue as well as to delay the emergence of mutations conferring resistance
See individual agents.