Related Experiment Video
Updated: Jun 5, 2026

11:17
Multiplex Therapeutic Drug Monitoring by Isotope-dilution HPLC-MS/MS of Antibiotics in Critical Illnesses
Published on: August 30, 2018
Single-dose therapy of infectious diseases
Canadian Family Physician Medecin De Famille Canadien
|January 26, 2011
Summary
Single-dose antimicrobial therapy offers advantages for infections like trichomonas vaginitis and uncomplicated cystitis. Co-trimoxazole demonstrates effectiveness and safety for single-dose bacterial cystitis treatment in women.
Area of Science:
- Pharmacology
- Infectious Diseases
- Urology
Background:
- Single-dose antimicrobial therapy presents advantages over multi-dose regimens.
- Historically, long-acting penicillins were used for single-dose treatments of streptococcal pharyngitis and syphilis.
- Shorter-acting agents are increasingly utilized for non-invasive mucosal infections.
Purpose of the Study:
- To evaluate the efficacy and safety of single-dose antimicrobial therapy for various infections.
- To address the controversy surrounding single-dose therapy for bacterial cystitis.
- To highlight effective single-dose treatment options for uncomplicated cystitis.
Main Methods:
- Review of existing literature on single-dose antimicrobial therapies.
- Analysis of efficacy data for metronidazole in trichomonas vaginitis.
- Assessment of evidence for co-trimoxazole in uncomplicated bacterial cystitis.
Main Results:
- A single 2g dose of metronidazole is approximately 92% effective for trichomonas vaginitis, considered a treatment of choice.
- Evidence supports the effectiveness and safety of 2 or 3 double-strength tablets of co-trimoxazole for uncomplicated bacterial cystitis in healthy women.
Conclusions:
- Single-dose therapy is a viable and advantageous treatment strategy for specific infections.
- Co-trimoxazole is a highly effective and safe single-dose option for uncomplicated bacterial cystitis.
- Further research may clarify the role of single-dose therapy in other conditions.
Related Concept Videos
Dosage Regimen: Fixed Dose
Fixed-dose regimens are a common approach to administer drugs to achieve and maintain desired levels of the drug in the body. In this dosing strategy, a specific amount of medication is given at regular intervals, often multiple times a day, to ensure a consistent drug concentration in the bloodstream.
Fixed-dose regimens can be used for various routes of administration, including intravenous (IV) injections and oral medications. For IV administration, a predetermined amount of the drug is...
Fixed-dose regimens can be used for various routes of administration, including intravenous (IV) injections and oral medications. For IV administration, a predetermined amount of the drug is...
Bioavailability Study Design: Single Versus Multiple Dose Studies
Bioavailability studies are essential for understanding how a drug is absorbed, distributed, metabolized, and excreted in the body. These studies assess the extent and rate at which the active pharmaceutical agent becomes available at the site of action. The design of bioavailability studies can involve single-dose or multiple-dose regimens, each with distinct advantages and limitations.Single-dose studies are the preferred approach due to their simplicity and reduced drug exposure for...
Combined Effects of Drugs: Synergism
Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
Such synergistic combinations...
Microorganisms in Medicine and Therapeutics
Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
Dosage Regimen: Individualization
Individualization in dosing regimens is the customization of medication doses for individual patients. Its necessity arises from the goal of maximizing therapeutic benefits while minimizing risks. This approach is pivotal because human responses to drugs can vary widely; what is effective for one person may be inadequate or excessive for another. Interpatient (intersubject) variability refers to differences in drug responses between individuals, while intrapatient (intrasubject) variability...
Drug Accumulation During Multiple Dosing: Intermittent IV Infusions
Intermittent intravenous (IV) infusion is a method of drug administration where medications are delivered over short infusion periods followed by intervals of no drug delivery. This approach helps to prevent sustained high drug concentrations in the bloodstream, reducing the risk of adverse effects associated with prolonged exposure. Unlike continuous infusion, steady-state concentrations may not be achieved during a single dosing cycle but can be reached through repeated...
