YABU and expecting too much too soon! The point of titration is to start at the lowest dose to minimise any side effects and these can be severe in some people, it's known to increase BP/ HR. Then gradually increase dose till you find the sweet spot with maximum benefits on adhd symptoms for tolerable side effects, they should push above to work out if better or worse rather than arbitrarily stop at say 54mg because that suits most of their patients as it's so highly individual and to do so would leave some with sub-optimal results.
Here's the Additude Ultimate Guide To ADHD Medications which may help
Its probably a slower process for children and but when I titrated on methylphenidate XL we did the following plan
Wk1 1 x18mg
Wk2 2x 18mg =36mg
Wk3-4 3x 18mg = 54mg -
At Wk3 they'd decide what to order for next month's prescription depending on the results
you may stay on 54mg, drop to 36mg or increase up to 72mg The max adult dose is 108mg (it's not dosed on weight).
I would have to submit a monitoring form each week to track side effects, any changes to ADHD symptoms, mood, sleep, appetite and check BP/ HR/ BMI. This would be reviewed by Titration Nurse or Psychiatrist and they'd advise on side effects and treatment plan accordingly. If had severe side effects would notify immediately and you can just cease taking the meds while wait for them to contact and advise as unlikely to be same day.
Methylphenidate is available in a range of brand/generics for both XL (and IR) but while the active ingredient is the same other ingredients vary as does the dosing ratio's in 3phase tablet so it's possible that it won't feel identical and may have different side effects. I had to stop taking one brand due side effects but thankfully had started titration on another so knew it wasn't actually the active ingredient.
The 2 stimulant families (methylphenidate in XL /IR) & Amphetamines ( lisdexamfetamine (XL) and Dexamfetamine (IR) the US also has Adderall ). The stimulants have the best efficacy which is why they're the first line of treatment over the non-stims.
Likely all down to our genes, but some find one family may have little to no effect even at high doses so would then switch to the other family. The majority will notice some benefit with both types but one family may suit them better in terms of benefits Vs side effects. Then those that didn't suit stimulants or have conditions which make them unsuitable can try the non- stimulants (Atomoxetine & Guanfacine)
Hormone fluctuations often make ADHD symptoms worse and meds seem less effective before & during periods.
Some also metabolise medication faster so it doesn't last as long as it should and they may be prescribed a top up of short release to extend or try different medication type.