What is the chances of not contracting a virus when having?
Mylan is the name of a pharmaceutical company, not a drug that I am aware of. Tenolam is commonly used as an HIV medication, but may have other uses as well. Assuming the person is HIV positive, which is not a huge leap, if they are taking Tenolam, you need to have a serious conversation. It is illegal for an HIV positive person to have sex without disclosing their condition. You need to find out for certain this person's status. You also need to find out how long they have been on medication and what their viral load might be. This conversation should take place before engaging in any sexual activity. An HIV positive person who is on medication may very well have an undetectable viral load. This means they are basically not capable of transmitting the virus. After your frank conversation, you and your partner will need to decide what type of sexual protection is best for your situation. To answer your original question, if your partner is on medication, and undetectable, the chances of catching HIV from him/her is very remote. Using protection would make it impossible. Ask questions, get answers, make informed decisions.