Given the risk of evolution of resistance, why do you think the two patients shown in Figure 1.1

Given the risk of evolution of resistance, why do you think...

Key Concepts

Dose_Optimization_in_Treatment_Strategies

Optimizing the dosing regimen is critical for maintaining drug efficacy while preventing the emergence of resistance. Starting with a lower dose may help manage toxicity and reduce the immediate selective pressure for resistant strains, allowing for a more controlled adjustment of therapy as the patient's condition and pathogen response are monitored.

Evolution_of_Drug_Resistance

This concept involves understanding how pathogens, such as viruses and bacteria, develop mutations that allow them to survive in the presence of drugs. The gradual emergence of resistant strains is a crucial consideration when designing treatment regimens, as the selective pressure imposed by the drug can favor the proliferation of these resistant mutants if not carefully managed.

Selective_Pressure

Selective pressure is the force exerted by administering drugs that can kill susceptible organisms while allowing pre-existing or newly arising resistant mutants to survive. This concept is central to the understanding of resistance evolution and helps explain why treatment strategies must balance effective pathogen eradication with minimizing the advantage given to resistant variants.

Pharmacodynamics_and_Toxicity

Pharmacodynamics, which studies how drugs affect organisms, including their efficacy and side effects, plays a key role in determining dosage. High doses may be more effective at reducing pathogen load but can also lead to severe toxic side effects in patients, making it essential to optimize dosing to both protect the patient’s health and limit resistance evolution.

Transcript

00:03 In this video, first we're going to be looking at this idea of how antivirals kind of work and then looking at why at some different prescribing techniques that doctors give to these people that have hiv.

00:20 So antivirals, antiviral drugs are kind of like what they say.

00:33 They attempt to kill viruses.

00:38 Okay.

00:40 And they can do that in a variety of ways.

00:43 And usually these antiviral drugs are very specific to the virus that we're looking at because each virus is unique and we have to have a drug that's specific and unique to those types of viruses.

00:54 What's crazy is these viruses can mutate very rapidly, rapidly, therefore causing a new strength.

01:04 Of virus, the antiviral drug now has to be altered or we have to find a new one to now hit that new strain.

01:11 And so these drugs are constant progress, tons of research has done into them to try and see how we can attempt to attack these different viruses.

01:25 And there's a question that comes up that's like this.

01:28 Usually when a person gets let's say that this person has hiv okay so he's not happy right and um he or she has hiv she or she is not happy and goes to the doctor the doctor usually will give him an antiviral drug and will not give him a high dose but a lower dose at first and then just kind of watch it over time and increase dose amount if needed over time.

02:07 Okay, that's kind of what happens.

02:08 And the question is, why doesn't it just instantly give them the increased dose amount? and the reason why this question comes about is because when we do the lower dose, it doesn't kill all the viruses and we allow this to happen.

02:22 Mutation.

02:23 And the lower dosage, it's just hard to tell...

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