Chemical Structure and Origin
The sole representative of this group is spectinomycin (Spectinomycinum). Naturally, the substance is produced by the actinomycete Streptomyces spectabilis. Chemically, the drug is a structural analogue of classical aminoglycosides, featuring a characteristic tricyclic structure.
Mechanism of Action and Pharmacodynamics
The antimicrobial effect of Spectinomycinum is exerted at the intracellular level:
- Target: Binds to the 30S subunit of the bacterial ribosome.
- Inhibition of protein synthesis: Blocks the process at the translocation stage.
Unlike related aminoglycosides, this drug does not cause misreading of mRNA codons, meaning errors in the genetic code do not occur. The primary pharmacodynamic difference lies in the type of antimicrobial response: spectinomycin exerts a bacteriostatic effect, halting microorganism replication without causing direct cell death. Its activity spectrum covers predominantly Gram-negative flora (Gram(-)).
Clinical Use and Place in Therapy
In medical practice, spectinomycin is used primarily to treat urogenital infections. The main indication for its prescription is gonorrhea in all its manifestations, including acute urethritis, prostatitis, cervicitis, and proctitis.
In modern therapy, this drug serves as a reserve medication (alternative option). Physicians prescribe it in two specific scenarios:
- The patient has a hypersensitivity to penicillin antibiotics.
- Gonococcal strains have acquired resistance to first-line drugs.
To achieve a therapeutic effect, the drug is administered intramuscularly — the procedure is performed as a single dose or divided into two injections administered at different anatomical sites.