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Roxithromycin



Roxithromycin
Systematic (IUPAC) name
 ?
Identifiers
CAS number 80214-83-1
ATC code J01FA06
PubChem 444037
DrugBank APRD01305
Chemical data
Formula C41H76N2O15 
Mol. mass 837.047 g/mol
Pharmacokinetic data
Bioavailability  ?
Metabolism Liver
Half life 12 hours
Excretion  ?
Therapeutic considerations
Pregnancy cat.

? (USA)
B1 (Aus)

Legal status
Routes  ?

Roxithromycin is a semi-synthetic macrolide antibiotic. It is used to treat respiratory tract, urinary and soft tissue infections. Roxithromycin is derived from erythromycin, containing the same 14-membered lactone ring. However, an N-oxime side chain is attached to the lactone ring. It is also currently undergoing clinical trials for the treatment of male-pattern hair loss.[1]

Roxithromycin is available under several brandnames, for example Surlid, Rulide, Biaxsig, Roxar and Roximycin. Roxithromycin is not available in the United States.

Additional recommended knowledge

Contents

History

German pharmaceutical company Hoechst Uclaf brought out roxithromycin in 1987.

Available forms

Roxithromycin is commonly available as tablets or oral suspension.

Mechanism of action

Roxithromycin prevents bacteria from growing, by interfering with their protein synthesis. Roxithromycin binds to the subunit 50S of the bacterial ribosome, and thus inhibits the translocation of peptides. Roxithromycin has similar antimicrobial spectrum as erythromycin, but is more effective against certain gram-negative bacteria, particularly Legionella pneumophila.

Pharmacokinetics

When taken before a meal, roxithromycin is very rapidly absorbed, and diffused into most tissues and phagocytes. Due to the high concentration in phagocytes, roxithromycin is actively transported to the site of infection. During active phagocytosis, large concentrations of roxithromycin are released.

Metabolism

Only a small portion of roxithromycin is metabolised. Most of roxithromycin is secreted unchanged into the bile and some in expired air. Under 10% is excreted into the urine. Roxithromycin's half-life is 12 hours.

Side effects

Most common side effects are gastrointestinal; diarrhoea, nausea, abdominal pain and vomiting. Less common side effects include central or peripheral nervous system events such as headaches, dizziness, vertigo, and also the rarely seen rashes, abnormal liver function values and alteration in senses of smell and taste.

Drug interactions

Roxithromycin has less interactions than erythromycin as it has a lower affinity for cytochrome P450.

Roxithromycin does not interact with hormonal contraceptives, prednisolone, carbamazepine, ranitidine or antacids.

When roxithromycin is administered with theophylline, some studies have shown an increase in the plasma concentration of theophylline. A change in dosage is usually not required but patients with high levels of theophylline at the start of the treatment should have their plasma levels monitored.

Roxithromycin appears to interact with warfarin. This is shown by an increase in prothrombin time (international normalised ratio (INR)) in patients taking roxithromycin and warfarin concurrently. As a consequence, severe bleeding episodes have occurred.

References

  1. ^ The Effect of 0.5% Roxithromycin Lotion for Androgenetic Alopecia - ClinicalTrials.gov. Retrieved on 2007-09-22.


 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Roxithromycin". A list of authors is available in Wikipedia.
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