Bug 
To dream of a bug represents an issue that is causing you apprehension. It refers to feelings of unease and concern. It also suggests that you are intense and serious about a new pursuit or leisure activity. In addition, the bug can symbolize fantasies and desires relating to sex.
Virus
To catch a virus in a dream represents spiritual or emotional contamination. You may be feeling vulnerable to the negative influence of others.
To dream of catching a computer virus symbolizes a lack of control in a part of your life, particularly at work.
Antibiotics
Dreaming of antibiotics indicates dissatisfaction with some aspect of your life. You view this as an 'infection' and your dream represents the desire to cure it.
- 1