I am 61 years old and suffering from rheumatoid arthritis for past five years and psoriasis for past fifteen years and more. I am taking folitrax injection 15 mg once in a week on saturdays for past two years. Previously I was taking methotrexate tablets 15 mg once a week but due to stomach problems I am taking folitrax injection. I am a diabetics since last one year and high blood pressure since 15 years. I take exermet 500 mg twice a day for diabetes and nicardia retardant 20 mg twice a day, corbis 5 mg and dytor 5 mg tablets once in a day for blood pressure. Please advise any safe drug for psorasis and arthritis. How long can I take methotrexate without any side effect.