I was on 10mg 4x per day for 4 years. Changed doctors and he suggested the dose might be too low to be effective. Ritalin dosage is not weight dependent. It is also metabolized very quickly. My doctor decreased the dosage to 3 times per day because doctors are under enhanced scrutiny now partially due to the Black Box warning cited below, in my opinion.
(Based on my understanding of the word ‘tolerance’ - how can being on the same dosage of medication for 6 years with no need to increase that dosage be defined as tolerance?)
Tolerance:
A phenomenon whereby a drug user becomes physically accustomed to a particular dose of a substance, and requires increasing dosages in order to obtain the same effects.Mentioned in: Addiction, Analgesics, Opioid, Substance Abuse and Dependence
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.)
[url="
http://www.addresour...andelkorn.php"]WHAT IS THE CORRECT DOSE?
If medications work, there is a best dose for each individual. Unfortunately, medical knowledge is not at a point where it can predict what the correct dose will be. This is not an unusual circumstance in medicine, however. For a person with diabetes, we must try different forms and amounts of insulin to achieve the best control of blood sugar levels. For people with high blood pressure, there are many medications that can be effective, and often a trial of multiple medications and dosages is needed to determine the best treatment.
For ADHD medications, there is no magic formula. The dose cannot be detemined by age, body weight, or severity of symptoms.
In fact, it appears that the correct dose is extremely individual and is not really predictable. Again, similar to people who need glasses, the kind of prescription and the thickness of the lenses is not dependent on any measurable parameter other than what you say enables you to see well. The dose of medication is determined solely by what ADHD patients need to improve their symptoms.
You must be willing to experiment with carefully observed dosage changes to determine your child's correct dosage.
Once the correct dosage is determined, it does not seem to change significantly with age or growth. Medication continues to work effectively through the teenage years and into adulthood if needed.For atomoxetine, the dosage at the present time is calculated according to weight. This is the only medication for ADHD for which this is true.
SAFETY PROFILE
The stimulant medications are one of the most studied treatments in the history of medicine. The medications have been used extensively in children and adults over the past 50 years with no evidence to date of long term concerning side effects. At this time there is no conclusive evidence that use of stimulants causes any long term lasting effects on growth, although there may be some delay in height and weight gain in some individuals.
The short acting stimulants are extremely abusable and are valued highly on the street. It is best to always use the long acting preparations which are not abusable to avoid the temptation of misuse and abuse.
There have been recent concerns expressed by the FDA and the press with regard to the use of stimulant medications and the risk of sudden unexpected death. This concern was a consequence of a study done in 1999-2003 in which they looked at a large number of individuals taking stimulants and felt that there may be a slight risk.
As reported in an excellent article in the New York Times Feb 14, 2006 the apparent calculated risk of sudden unexpected death in those using amphetamines was 0.35/million (1 in 3 million) prescriptions and the risk for those on stimulants was 0.18/million (1 in 5 million) prescriptions. There is no real evidence that this is any different from that which occurs in the normal population. These extraordinary events of unexpected death tended to occur in individuals with congenital cardiac defects. For this reason the FDA issued a BLACK BOX warning to all physicians that stimulants should be used very cautiously or not at all in individuals with congenital cardiac defects.METHYLPHENIDATE TABLETS 2-4 hours (Ritalin IR)
Form:
Short acting tablets administered by mouth. Methylphenidate (MPH)5 mg, 10 mg, 20 mg
Dosage:
Very individual.
Average 5 mg – 20 mg every 4 hours. I prescribe 5 mg to start and raise by 5 mg every 4–5 days with close observation until correct dose is achieved.
Duration of Action:
Rapid acting Ritalin starts to work in 15–20 minutes, which is extremely helpful for some individuals who has trouble starting their day, Some children will need medication 20 minutes BEFORE time to get up, followed by a long–acting medicaiton at breakfast. Often used as a booster for evening coverage.
Possible Side Effects:
See above
Pros:
Very easy to use for short periods of coverage, such as early morning and evening.
Cons:
Must be administered frequently during the day (3-5 times/day). Inconvenient to use at school. Often causes rebound and roller coaster effect. Very abusable.
Edited by JLynne, 05 December 2010 - 09:00 PM.