The drugs cause desired short-term disruptions in the brain, but they also cause undesirable long-term changes to the brain and other vital organs in the body, leading to drug addiction. Common drug addictions include: 1  Marijuana. 2  Heroin. 3  Cocaine/crack. 4  Synthetic drugs such as bath salts and spice.
1 Penicillin G, common vet prescriptions known as CrystacillinÂ® or Flo-CillinÂ®, is an antibiotic used to treat and prevent bacterial infections in dogs and cats. 2  This is a natural penicillin and is cultured from the bacteria Penicillium chrysogenum.
Examples. Penicillin is the antibiotic most commonly used to treat syphilis. Penicillin is usually given as a shot (injection). If you are allergic to penicillin, your doctor may prescribe another antibiotic in early stages of syphilis, such as doxycycline, tetracycline, ceftriaxone, or azithromycin.Or he or she may desensitize you so that you can safely take penicillin. Later stages of syphilis may require treatment with penicillin.Penicillin is the only antibiotic that should be used during pregnancy. If you are pregnant and think you may be allergic to penicillin, discuss your allergy with your doctor.enicillin is usually given as a shot (injection). If you are allergic to penicillin, your doctor may prescribe another antibiotic in early stages of syphilis, such as doxycycline, tetracycline, ceftriaxone, or azithromycin. Or he or she may desensitize you so that you can safely take penicillin.