Dihydrostreptomycin is an antibiotic compound derived from streptomycin by reduction with hydrogen. The primary mechanism of action of the antibiotic dihydrostreptomycin is binding to and modifying the function of the bacterial ribosome, thus leading to decreased and aberrant translation of proteins, in addition it binds mechanosensitive channel of large conductance (MscL) and modifies its conformation, thus allowing the passage of K+ and glutamate out of, and dihydrostreptomycin into, the cell. It has about the same degree of antibacterial activity as streptomycin, but it is less effective against some gram-negative microorganisms. Because it has a higher risk of irreversible deafness, and its effectiveness is no greater that that of streptomycin, dihydrostreptomycin is no longer used clinically. To date dihydrostreptomycin is approved for veterinary use to treat bacterial infections.

Sulfamethazine is a sulfonamide used to treat a variety of bacterial diseases in animals. It inhibits bacterial synthesis of dihydrofolic acid by competing with para-aminobenzoic acid (PABA) for binding to dihydropteroate synthetase (dihydrofolate synthetase).

Azidocillin is a narrow-spectrum, semisynthetic penicillin derivative with antibacterial activity towards Grain-positive and Gram-negative microorganisms, including Haemophilus influenze, against which it is as effective as ampicillin. Azidocillin binds to and inactivates penicillin-binding proteins (PBPs) located on the inner membrane of the bacterial cell wall. Inactivation of PBPs interferes with the cross-linkage of peptidoglycan chains necessary for bacterial cell wall strength and rigidity. This interrupts bacterial cell wall synthesis and results in the weakening of the bacterial cell wall, eventually causing cell lysis. Azidocillin can be applied in the treatment of inflammation of upper airways, middle ear, sinuses, throat, larynx and palatine tonsils. The substance is excreted with urine in 50-70% in the unchan¬ged form. It binds to the blood plasma proteins in 84%, and its half-life period is 30 min. The side effects are similar as those of benzylpenicillin but occur less frequently.

Propicillin (Baycillin Mega) is this semisynthetic penicillin, analogous to penicillin V, was introduced in the early 1960s. Although it is better absorbed from the gastrointestinal tract, overall it is inferior to phenoxymethylpenicillin and phenoxyethylpenicillin because of its lower antibacterial activity. Propicillin is used by propicillin-susceptible pathogens in adults and adolescents from 14 years to treat mild to moderate bacterial infections. These include skin infections, ear, nose and throat infections (such as otitis media, sinusitis, tonsillitis, pharyngitis) and infections of the bronchi andlung inflammation. Moreover propicillin can for prevention and treatment of scarlet fever or against rheumatic fever are used (bacterial infection of the nose and throat). Even with tooth or jaw surgery the drug is used to treat an endocarditis endocarditis prevent. Its mechanism of action could be due to binding to specific penicillin-binding proteins (PBPs) located inside the bacterial cell wall, thus propicillin may inhibit the third and last stage of bacterial cell wall synthesis

Pyrovalerone is a psychostimulant. It has a central action. Pyrovalerone inhibits the dopamine transporter and the norepinephrine transporter, and is a weak inhibitor of the serotonin transporter. Pyrovalerone was demonstrated to reduce symptoms of chronic fatigue in humans. It stimulated locomotor activity in mice. Though pyrovalerone is still occasionally prescribed, it is used infrequently due to problems with abuse and dependence. Side effects of pyrovalerone include anxiety, fragmented sleep or insomnia and trembling, shaking or muscle tremors.

Apalcillin is a naphthydridine derivative of ampicillin. Apalcillin has a broad spectrum of antibacterial activity that is very similar to that of piperacillin, except that apalcillin is significantly more active against Pseudomonas aeruginosa and Acinetobacter spp. Against Acinetobacter spp., apalcillin is uniquely active, compared to the other penicillins and comparison drugs. Strains producing high amounts of β-lactamases do become resistant to apalcillin. PAH (p-aminohippurate) clearance was significantly decreased during apalcillin infusion. Apalcillin appeared to compete with PAH for proximal tubular secretion but induced no further renal dysfunction.