Dynacin ® is a tetracycline-class antibiotic medicine. Dynacin ® is used to treat certain infections caused by bacteria. These include infections of the skin, respiratory tract, urinary tract, some sexually transmitted diseases, and others. Dynacin ® may be used along with other treatments for severe acne. Sometimes, other germs, called viruses cause infections. The common cold is a virus. Dynacin ®, like other antibiotics, does not treat viruses. Who should not use Dynacin ®? Do not take Dynacin ® if you are allergic to minocycline or other tetracycline antibiotics. Ask your doctor or pharmacist for a list of these medications if you are not sure. See the end of this leaflet for a complete list of ingredients in Dynacin ®. Dynacin ® is not recommended for pregnant women or children up to 8 years old because: 1.