It is not a good idea to share your prescription with another person, even if you think they have the same illness as you. You must take your entire prescription as prescribed. For example, if you need to take Vibramycin for two weeks, you should take it every day for that whole period until you finish your prescription. Taking your antibiotic as prescribed ensures that you have eliminated the infection. It will also reduce the risk of developing strains of drug-resistant bacteria. Additionally, another person who is sick may require different therapy. They should seek treatment from a medical professional.