From pfizer's press release on paxlovid:
https://www.pfizer.com/news/press-r...r-announces-additional-phase-23-study-results
Yup, same ideal window of use as ivermectin - which sucks, because it's hard to catch a case that early, since symptoms aren't typically present by that time.
From the FDA's take:
HIV-1 drug resistance is potentially deadly and no surprise considering we're talking about a repurposed HIV drug that never got approved for HIV.
Ivermectin does not carry the same warnings and contradictions related to the liver and kidney. It's very safe compared to many drugs in it's class.
Efficacy wise? Pfizer quotes a 10-fold reduction in viral replication in ideal conditions.
Research papers cite a range of 12-50 fold reduction for Ivermectin using high doses of Ivermectin in *very* early treatment, or as prophylaxis. But the earlier, the better.
My best guess based on all the research i've read is that Ivermectin is much safer than paxlovid, but only has good efficacy if given earlier. Paxlovid trades safety for efficacy and is more of a life saver if you're in the later stages of infection.
I would bet Ivermectin would be pretty potent if the doses were higher. The LD50 for ivermectin is 250 times higher than the 24mg dose used in most Ivermectin covid trials. Side effects in those trials were exceedingly low - close to placebo.
https://www.pfizer.com/news/press-r...r-announces-additional-phase-23-study-results
Final data available from all high-risk patients enrolled in EPIC-HR study (n= 2,246) confirmed prior results of interim analysis showing PAXLOVID™ (nirmatrelvir [PF-07321332] tablets and ritonavir tablets) reduced risk of hospitalization or death by 89% (within three days of symptom onset) and 88% (within five days of symptom onset) compared to placebo; no deaths compared to placebo in non-hospitalized, high-risk adults with COVID-19
Yup, same ideal window of use as ivermectin - which sucks, because it's hard to catch a case that early, since symptoms aren't typically present by that time.
From the FDA's take:
Possible side effects of Paxlovid include impaired sense of taste, diarrhea, high blood pressure and muscle aches. Using Paxlovid at the same time as certain other drugs may result in potentially significant drug interactions. Using Paxlovid in people with uncontrolled or undiagnosed HIV-1 infection may lead to HIV-1 drug resistance. Ritonavir may cause liver damage, so caution should be exercised when giving Paxlovid to patients with preexisting liver diseases, liver enzyme abnormalities or liver inflammation.
Because Paxlovid works, in part, by inhibiting a group of enzymes that break down certain drugs, Paxlovid is contraindicated with certain drugs that are highly dependent on those enzymes for metabolism and for which elevated concentrations of certain drugs are associated with serious and/or life-threatening reactions. Paxlovid is also contraindicated with drugs that, conversely, strongly induce those same enzymes, leading to the faster breakdown of nirmatrelvir or ritonavir, as reduced concentrations of nirmatrelvir or ritonavir may be associated with potentially losing virologic response and developing viral resistance. Paxlovid cannot be started immediately after discontinuing such medications because the effects of those medications remain after discontinuation. For a complete list of drugs that should not be taken in combination with Paxlovid, see the fact sheet for healthcare providers.
HIV-1 drug resistance is potentially deadly and no surprise considering we're talking about a repurposed HIV drug that never got approved for HIV.
Ivermectin does not carry the same warnings and contradictions related to the liver and kidney. It's very safe compared to many drugs in it's class.
Efficacy wise? Pfizer quotes a 10-fold reduction in viral replication in ideal conditions.
Research papers cite a range of 12-50 fold reduction for Ivermectin using high doses of Ivermectin in *very* early treatment, or as prophylaxis. But the earlier, the better.
My best guess based on all the research i've read is that Ivermectin is much safer than paxlovid, but only has good efficacy if given earlier. Paxlovid trades safety for efficacy and is more of a life saver if you're in the later stages of infection.
I would bet Ivermectin would be pretty potent if the doses were higher. The LD50 for ivermectin is 250 times higher than the 24mg dose used in most Ivermectin covid trials. Side effects in those trials were exceedingly low - close to placebo.