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MDCalc is a free online medical reference for healthcare professionals that provides point-of-care clinical decision-support tools, including medical calculators, scoring systems, and algorithms. [1]
Levofloxacin, sold under the brand name Levaquin among others, is a broad-spectrum antibiotic of the fluoroquinolone drug class. [6] It is the left-handed isomer of the medication ofloxacin .
Caution should be exercised in long-term use when breastfeeding. Short-term use is safe; bioavailability in milk is low to nil. [ 23 ] According to the U.S. Food and Drug Administration (FDA), cases of Stevens–Johnson syndrome , toxic epidermal necrolysis , and erythema multiforme associated with doxycycline use have been reported, but a ...
Doxycycline is highly lipophilic, so it can easily enter cells, meaning the drug is easily absorbed after oral administration and has a large volume of distribution. It can also be re-absorbed in the renal tubules and gastrointestinal tract due to its high lipophilicity, giving it a long elimination half-life.
In survival analysis, the hazard ratio (HR) is the ratio of the hazard rates corresponding to the conditions characterised by two distinct levels of a treatment variable of interest. For example, in a clinical study of a drug, the treated population may die at twice the rate of the control population.
Quinolone antibiotics constitute a large group of broad-spectrum bacteriocidals that share a bicyclic core structure related to the substance 4-quinolone. [1] They are used in human and veterinary medicine to treat bacterial infections, as well as in animal husbandry, specifically poultry production.
Acute use (1–3 days) yields a potency about 1.5× stronger than that of morphine and chronic use (7 days+) yields a potency about 2.5 to 5× that of morphine. Similarly, the effect of tramadol increases after consecutive dosing due to the accumulation of its active metabolite and an increase of the oral bioavailability in chronic use.
Faster or stronger binding is represented by a higher affinity, or equivalently a lower dissociation constant. The EC 50 should not be confused with the affinity constant, K d. While the former reflects the drug concentration needed for a level of tissue response, the latter reflects the drug concentration needed for an amount of receptor binding.