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Modeling Pharmacodynamics on HIV Latent Infection: Choice of Drugs is Key to Successful Cure via Early Therapy

Highly active antiretroviral therapy has successfully controlled HIV replication in many patients. The treatment effectiveness may depend on the pharmacodynamics of antiretroviral drugs. In this paper, we integrate several drug-related parameters into an HIV infection model to investigate the effects of drug pharmacodynamics on the HIV latent reservoir and viral load dynamics. We showed that pharmacodynamic characteristics of drugs and the dosing schedule can significantly affect the outcome of either early or late treatment. Variations in each of the four studied parameters (the slope of the dose-response curve, the ratio of the maximum dosage to the 50% inhibitory concentration, the drug's half-life, and the dosing interval) can generate either an infection-free steady state or persistent infection when the other parameters remain unchanged. The global stability of the infection-free steady state and the viral persistence are shown to be governed by a viral invasion threshold that depends on the drug ph...