Hydrogen peroxide tolerance builds up over time. Each time you expose yourself to a dose of hydrogen peroxide, you stimulate your production of catalase and glutathione peroxidase, which dismutate the extra hydrogen peroxide. So with regular exposure, your levels of these enzymes goes up, allowing a bigger dose to be tolerated. And with cessation of exposure, the enzymes drop back to their regular levels. So you should start with only one drop and work your way up. Depending on the strength of the peroxide stock solution you are using, this can be slow (if it is strong), or fast (if it is weak).
In children (and adults) with Down's syndrome, they naturally have higher hydrogen peroxide levels all the time. This happens because they have an extra copy of their 21st chromosome, which carries the superoxide dismutase gene. Their SOD enzyme levels are roughly 50% higher, and this depletes superoxide (the substrate, or input to SOD) and raises hydrogen peroxide (the output, or product of SOD). As a result of this higher H2O2, their catalase and glutathione peroxidase go up, and stay up, just as if they were taking peroxide supplementally.
Food grade hydrogen peroxide can come in strengths varying from 3% to 35%. So you'd have to use 10-12 drops of 3% before you'd get to the same level as one drop of 35%.
Hydrogen peroxide is a general stimulant to metabolic rate. Low metabolic rate is a pro-viral influence, so H2O2 might show antiviral effects. But this is not guaranteed as there are other pro-viral factors other than low metabolic rate that might be involved in a particular person's situation.
And even if low metabolic rate IS a cause for you, H2O2 might not be the most effective way to compensate. If your low metabolic rate is caused by low levels of thyroid hormone (hypothyroidism), it will provide only a limited benefit. If your low metabolic rate is caused by lack of thyroid receptor activity, heavy metal toxicity, an overly alkaline diet, estrogen dominance, or a nutritional deficiency of some kind, the peroxide effect will be limited. But if your low metabolic rate is caused by low oxygen availability in your mitochondria, the peroxide might seem like a miracle cure.
By the way, most lipid-enveloped viruses are not "gotten rid of" by therapies. They merely encourage the virus to attenuate so that it is inactive or silent. With herpes, for example, roughly 99% of the human race is infected, but only a few percent have repetitive flareups. So even people who say they do not have herpes actually do have herpes. The average person who dies of old age has more herpes virions and genomes their body than they do human cells of all types combined. This is why scientists have found herpes actively replicating in the brains of people with Alzheimer's disease at autopsy. The metabolic failures that occur at death are very similar to the metabolic imbalances that cause people to have regular flare ups. Only worse. (OK, you can chuckle here.) So the secret to finding a successful herpes (or other virus) treatment is matching the intervention to the metabolic imbalance. When you do that well, you get good results. And sustainable results. If you do not get good results, or if your results are not sustainable, then you need to keep searching.
I hope this helps.