Precautions and warnings to be aware of prior to taking Ritalin SR include the following:
Stimulants (including Ritalin SR) are often abused. Taking amphetamines for a long time can lead to drug dependence (see Ritalin Abuse). Because Ritalin SR is often abused, there are special rules for prescribing it (see Ritalin: A Controlled Substance).
In people with psychotic disorders (such as schizophrenia or schizoaffective disorder), Ritalin SR can make psychotic symptoms worse, including thought disorders and behavior problems.
Sudden death has been reported in children and adults with heart problems who were taking normal doses of Ritalin SR. If you or your child has heart problems, ask your healthcare provider whether Ritalin SR is appropriate in your situation. Also, let your healthcare provider know if you or your child develops any chest tightness, chest pain, shortness of breath, or fainting.
Ritalin SR can cause an increase in blood pressure and heart rate. In most cases, the increase is small and does not cause problems. However, there is an increased risk for people who already have high blood pressure, congestive heart failure, certain irregular heart rhythms (arrhythmias), or recently had a heart attack.
The medication can cause a temporary slowing of growth and decreased weight gain in children. This slowing down of growth is usually small (less than an inch and less than two pounds), and children usually catch up to normal growth rate with time. Your child's growth should be monitored while he or she is taking Ritalin SR.
Ritalin SR may affect your ability to perform tasks that require complete concentration, such as driving, operating machinery, or piloting an airplane, especially during the first few weeks of treatment. It is recommended that you discuss this with your healthcare provider before starting the drug.
The medicine is considered a pregnancy Category C medication. This means that it may not be safe to use during pregnancy. Discuss the safety with your healthcare provider before using the drug during pregnancy (see Ritalin SR and Pregnancy).
It is not known if Ritalin SR passes through breast milk. Therefore, if you are breastfeeding or plan to start, discuss this with your healthcare provider.
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