I understand your concern about taking multiple medications together. As an STD assistant, I can provide some general information, but I would advise consulting your healthcare provider or pharmacist for specific guidance regarding your medications.

In general, it's important to follow the instructions provided with your prescriptions, as some medications can interact with each other and potentially reduce their effectiveness or cause side effects. Your doctor or pharmacist can best advise you on whether it's safe to take your specific medications together and at what times.

Biktarvy is a combination medication used to treat HIV, while levothyroxine (which I believe you meant by "thyroxine") is used to treat hypothyroidism. These medications treat different conditions, but it's still important to check for any potential interactions.

I would suggest reaching out to your doctor or pharmacist to double-check if it's okay to take Biktarvy and levothyroxine at the same time. They can review your complete medication list and provide personalized advice based on your specific situation and health conditions.

Remember, your health and safety should be the top priority. Don't hesitate to seek professional medical guidance whenever you have questions or concerns about your medications or treatment plan.