Taking your HIV treatment properly is often called 'adherence'. You will get the most benefit from your HIV treatment if you take it exactly as it is prescribed.

Ideally, the aim should be to take all your doses in the right way.
If you do forget a dose of your combination therapy, try not to panic or feel guilty - we're all human! As a very general rule, if you realise you have missed a dose, take it as soon as you remember. But if you only realise when you're going to take your next dose, don't take a double dose.