Cold sores are caused by the herpes simplex type 1 virus and are contagious whereas canker sores are not. Also, cold sores can appear outside the mouth in places such as under the nose, on the lips or under the chin while canker sores always appear inside the mouth.anker sores, or aphthous stomatitis, are small ulcers in your mouth that cause pain and discomfort when talking or eating. Canker sores come in two varieties: simple and complex.
Codeine, which is found in many pain relievers, may cause a false positive for morphine or heroin because of its similar chemical structure. Antibiotics. Certain newly developed antibiotics including amoxicillin and ampicillin have been reported to cause false positives for cocaine. DHEA
The drug is habit-forming when taken repeatedly and sustained use of codeine can lead to a number of physical and psychological dependence factors that are difficult to treat. Codeine can be a dangerous substance if it is not taken exactly as prescribed or if the drug is taken with other medications or alcohol.Codeine and alcohol can have deadly side effects because both of these substances cause central nervous system depression that can lead to come, seizures, and death.Talk to your doctor if you are a regular drinker and you have been prescribed codeine for the treatment of cough or pain.odeine and alcohol can have deadly side effects because both of these substances cause central nervous system depression that can lead to come, seizures, and death. Talk to your doctor if you are a regular drinker and you have been prescribed codeine for the treatment of cough or pain.