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Roxithromycin
Clinical data
Trade names	Rulide, Biaxsig, others
AHFS/Drugs.com	International Drug Names
Pregnancy; category	AU: B1; ;
ATC code	J01FA06 (WHO) ;
Legal status
Legal status	AU: S4 (Prescription only); In general: ℞ (Prescription only);
Pharmacokinetic data
Metabolism	Liver, peak concentration averaging 2 hours after ingestion.
Elimination half-life	11 hours
Identifiers
	IUPAC name (3R,4S,5S,6R,7R,9R,11S,12R,13S,14R)-6-{[(2S,3R,4S,6R)-4-(Dimethylamino)-3-hydroxy-6-methyloxan-2-yl]oxy}-14-ethyl-7,12,13-trihydroxy-4-{[(2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyloxan-2-yl]oxy}-3,5,7,9,11,13-hexamethyl-10-(2,4,7-trioxa-1-azaoctan-1-ylidene)-1-oxacyclotetradecan-2-one;
CAS Number	80214-83-1 ;
PubChem CID	6915744;
IUPHAR/BPS	1465;
DrugBank	DB00778 ;
ChemSpider	5291557 ;
UNII	21KOF230FA;
KEGG	D01710 ;
ChEBI	CHEBI:48935 ;
ChEMBL	ChEMBL1214185 ;
PDB ligand	ROX (PDBe, RCSB PDB);
CompTox Dashboard (EPA)	DTXSID8041117 ;
ECHA InfoCard	100.121.308
Chemical and physical data
Formula	C41H76N2O15
Molar mass	837.058 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES O=C3O[C@H](CC)[C@](O)(C)[C@H](O)[C@H](\C(=N\OCOCCOC)[C@H](C)C[C@](O)(C)[C@H](O[C@@H]1O[C@H](C)C[C@H](N(C)C)[C@H]1O)[C@H]([C@H](O[C@@H]2O[C@H]([C@H](O)[C@](OC)(C2)C)C)[C@H]3C)C)C;
	InChI InChI=1S/C41H76N2O15/c1-15-29-41(10,49)34(45)24(4)31(42-53-21-52-17-16-50-13)22(2)19-39(8,48)36(58-38-32(44)28(43(11)12)18-23(3)54-38)25(5)33(26(6)37(47)56-29)57-30-20-40(9,51-14)35(46)27(7)55-30/h22-30,32-36,38,44-46,48-49H,15-21H2,1-14H3/b42-31+/t22-,23-,24+,25+,26-,27+,28+,29-,30+,32-,33+,34-,35+,36-,38+,39-,40-,41-/m1/s1 ; Key:RXZBMPWDPOLZGW-XMRMVWPWSA-N ;
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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. but with an N-oxime side chain attached to the ring.

Roxithromycin was patented in 1980 and approved for medical use in 1987.^[1] It is available under several brand names. Roxithromycin is available in Australia, France, Germany, Israel, South Korea and New Zealand, but not in the United States. It has also been shown to possess antimalarial activity.^{[citation needed]}

Side effects

The 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.Rarely seen side effects are rashes, abnormal liver function values and alteration in the senses of smell and taste.^{[citation needed]}

Drug interactions

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

Roxithromycin is not known to 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 and/or international normalised ratio (INR) in patients taking roxithromycin and warfarin concurrently. As a consequence, severe bleeding episodes have occurred.

Available forms

Roxithromycin is commonly available as tablets or oral suspension.^{[citation needed]}

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 synthesis of peptides. Roxithromycin has similar antimicrobial spectrum as erythromycin, but is more effective against certain gram-negative bacteria, particularly Legionella pneumophila.^{[citation needed]}

Pharmacokinetics

When taken before a meal, roxithromycin is very rapidly absorbed, and diffuses 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.^{[citation needed]}

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.