Brand name : Natdac
Active substance : Daclatasvir
Strength : 60mg
Manufactured by : Natco Pharma
Pack : 28 tablets in a container
Category : Anti-viral drug


Natdac is an anti-viral medication which is used for preventing the disease progression of hepatitis C viral infection by reduces the multiplication of virus in the body. Natdac is used by combining with other anti-virals for treating the HCV infection in chronic stage majorly in adults. Natdac is usually combined with Sofosbuvir, with or without ribavirin.


Natdac is belongs to class like;
Anti-hepaciviral drug
HCV NS5A protein inhibitor


Natdac is a NS5A protein inhibitor, NS5A is a HCV non structural phosphoprotein that is responsible for replicating function of charge of viral RNA augmentation on endoplasmic reticulum membranes. Natdac has ability to merge to viral RNA. There are two pathway involved in the mechanism of Natdac; Cis acting function of basally phosphorylated NS5A is responsible for maintaining the HCV replication complex. HCV assembly & infectious particle formation is altered by Trans acting function of hyperphosphorylated NS5A. Natdac is used to confuse the hyperphosphorylated NS5A proteins thus concludes as interceding with activity of newly produced HCV. Natdac works as blockade of; Intercellular viral RNA synthesis Virion assembly/ secretion in-vivo


Before starting the treatment; Patient’s HBsAg & anti-HBc levels should be monitored. Hepatic function test should be performed.

Genotype I

Without cirrhosis or Compensated cirrhosis: One Natdac with sofosbuvir or 12 weeks. Decompensated cirrhosis: One Natdac with sofosbuvir combined with ribavirin for 12 weeks Post transplant: One Natdac + sofosbuvir combined with ribavirin for 12 weeks. Genotype III; Without cirrhosis: One Natdac tablet should be combined with sofosbuvir for 12 weeks. Compensated or decompensated cirrhosis: One Natdac with sofosbuvir combined with ribavirin for 12 weeks


HBV reactivation :
In HBV/HCV co infected patients, HBV reoccurrence occurs after completion of HCV anti-viral agents but not getting the HBV anti-viral agents. This fatal case causes hepatic failure & finally leads to death. Overcome the problem by measuring HBsAg & anti-HBc before starting the treatment. Initiate the patient management for HBV infection. Hepatic function test should be performed.

Increased exposure of loss of virological responses :

The concurrent use of Natdac with other drugs may leads to loss of therapeutic effect of Daclatasvir & possible advancement of resistance. Dosage modification should be involved during combinational treatment. The adverse reactions related to the concomitant use should be monitored.

Risk due to ribavirin :

The combination of Natdac & sofosbuvir with ribavirin should produce fetal harm during pregnancy period.

Symptomatic bradycardia

This lethal case should be occurred during the concomitant use of Natdac with amiodarone. This should be prevented by avoiding this combination. Monitor the ECG during the treatment. Initiate the alternative therapy for reducing the cardiac disorders. Counsel the patient before starting the treatment about the risk related to this combinational therapy.


Natdac combined with the strong inducers of CYP3A causes depletion of plasma evels of Daclatasvir which concludes as loss of therapeutic activity of Natdac. Natdac tablet combined with P-gp or BCRP substrates causes increased systemic exposure of these substrates & elevates the adverse effects related to this substrates. Natdac combined with warfarin causes bleeding effects by altering the prothrombin time & INR values. Natdac with protease inhibitors causes increased Daclatasvir effect of concentration, to prevent this problem by reducing the dose of Natdac to 30mg as once daily. Natdac combined with NNRTI, causes decreased Daclatasvir concentration, overcome the problem by increasing the dose of Natdac to 90mg. Natdac with strong CYP3A inhibitors causes increased Daclatasvir concentration. Natdac with moderate CYP3A inducers causes reduced concentration of Daclatasvir. Natdac with amiodarone causes serious bradycardia Natdac with lipid lowering drugs causes increased concentration of these drugs.


The combination of Natdac & sofosbuvir with ribavirin is contraindicated to pregnancy & lactating period. Hypersensitivity reactions are produced during the therapy while patients are contraindicated to component of Natdac.

Over Dosage

No specific anti-toxin is required for treating the over dosage of Natdac. Patient should be provided with general supportive measures. The signs & symptoms of Natdac over dosage should be monitored. Hemodialysis should not be applicable; it is difficult to remove from the body because it is highly bounds to human plasma protein.

Missed Dose

If patients missed a dose then should be consult with medical practitioner & follow the instructions. On the other hand missed dose should be skipped. Avoid self medication Maintain the regular dosing schedule.


Pregnancy category of Natdac is B Natdac with sofosbuvir pregnancy category is B Ribavirin pregnancy category is X Ribavirin should not be used in pregnancy condition.


Breast feeding should not be suggested.


The safety & effectivity of Natdac in pediatric patients below 18 years should not be evaluated.


No dosage adjustment should be recommended


Chest pain or discomfort, Dizziness, Irregular heartbeat, Tiredness, Head ache , Nausea, Diarrhea, Insomnia, Dry skin, Influenza like syndrome, Dyspnea, Neutropenia, Pruritus, Thrombocytopenia, Bradycardia , Increased AST, ALT, Increased bilirubin, Hepatitis B reactivation .


Dosage modification should not be recommended in both renal & hepatic impaired patients.


Store the container at temperature 25℃ (77℉). Keep the container away from moisture, heat & light.

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