See the DrugPatentWatch profile for methotrexate

After reviewing available resources, there is no definitive chart or guideline for recommended methotrexate doses based solely on age. Methotrexate is a prescription medication used to treat various conditions, including certain types of cancer, rheumatoid arthritis, and psoriasis [1]. Factors such as the patient's condition, weight, and overall health are considered when determining the appropriate dosage [1].

For the treatment of rheumatoid arthritis, the starting dose of methotrexate is typically 7.5 mg once a week, and it can be increased by 2.5-5 mg every 4-6 weeks until the patient achieves the desired response or experiences side effects [1]. For the treatment of cancer, the dosage can vary greatly depending on the type and stage of cancer [1].

It is crucial to note that methotrexate should be administered under the supervision of a healthcare professional, as it can have severe side effects and interactions with other medications [1]. Additionally, the dosage may need to be adjusted based on the patient's kidney and liver function, as methotrexate is primarily eliminated from the body by these organs [1].

In summary, methotrexate dosages are not typically determined based on age alone. Instead, healthcare providers consider various factors, including the patient's condition, weight, and overall health, when determining the appropriate dosage.

Sources:
[1] DrugPatentWatch.com - Methotrexate
<https://www.drugpatentwatch.com/drugs/methotrexate>