HIV treatment reduces the amount of virus in the body, thus the chances of someone living with HIV transmitting it to a negative partner are decreased dramatically. 

If you are on treatment and have an undetectable viral load for over 6 months, you cannot pass HIV on to your sexual partners. This is also known as Undetectable = Untransmittable (U=U) or treatment as prevention (TasP). 

If you are struggling to take your medication, or experiencing side effects there are many places you can go to for support. You can speak to your HIV clinician to discuss different treatment options. MyHIV an online community for people living with HIVIbase is another useful website with information on treatments.