Areas › Focus, starting, and ADHD › Medication and how it works
When someone worries that the strength of their tablet might vary a little, the first question is how wide the safe band is for that particular medicine. For most psychiatric drugs the band is generous, and small differences never reach the person at all.
A wide therapeutic window means the gap between too little and too much is large, so ordinary variation gets absorbed on the way. A narrow one means the same variation can move someone from helped to harmed. Knowing which kind of medicine you are dealing with tells you whether to reassure or to check, and it saves a lot of worry spent on the wrong drugs.
This explains how treatments work. Never start, stop or change a medication because of something you read here.
Qur’an and Sunnah
'Give full measure when you measure, and weigh with accurate scales: that is better and fairer in the end' (Quran 17:35). Care over an exact amount is named as a virtue, and careful dosing is that same care.
وَأَوۡفُواْ ٱلۡكَيۡلَ إِذَا كِلۡتُمۡ وَزِنُواْ بِٱلۡقِسۡطَاسِ ٱلۡمُسۡتَقِيمِۚ ذَٰلِكَ خَيۡرࣱ وَأَحۡسَنُ تَأۡوِيلࣰ ا
Give full measure when you measure, and weigh with accurate scales: that is better and fairer in the end
Qur’an 17:35read it in the library
Translation: M.A.S. Abdel Haleem, The Qur'an, Oxford University Press, 2004.
What the research says
An open label study followed adults with ADHD through a year of ordinary treatment. Benefit was there, and so was a good deal of dose adjustment and a real burden of side effects along the way. It was observational rather than controlled, so it cannot show what caused what, but it does show that finding the right amount is normally a process rather than a single correct number arrived at once.
Fredriksen M, Dahl AA, Martinsen EW, Klungsøyr O, Haavik J, Peleikis DE. (2014). Effectiveness of one-year pharmacological treatment of adult attention-deficit/hyperactivity disorder (ADHD): an open-label prospective study of time in treatment, dose, side-effects and comorbidity.. European neuropsychopharmacology : the journal of the European College of Neuropsychopharmacology doi
Strength of evidence: one line of research. A single study, or a theoretical account.
Why it works
The same small change in blood level means nothing when the safe range is broad and a great deal when it is thin.
When not to
For a medicine that requires blood tests, treat any change of brand or formulation as a reason to speak to the prescriber first.
This one is still a draft. It is waiting on a scholar and a clinician to read it before it is published.
Near this one
When a dose wears off, things can feel worse than they ever did untreated. A good deal of that is contrast rather than the medicine leaving a debt behind.
One of the founding figures of biological psychiatry summed the whole business up as some medicine helping some people at some doses some of the time. Knowing that before you start makes the first disappointment much easier to survive.
Offered ten pounds now or twenty in an hour, plenty of people with attention difficulties take the ten and know while they are doing it that it makes no sense. The pull towards now is not a flaw of character.