Recommended Carisoprodol Dosage. The recommended starting dosage of carisoprodol is one tablet (of either strength, 250 mg or 350 mg) three times a day and at bedtime.Carisoprodol is intended to be used for a maximum of two to three weeks at a time.This should be enough time to allow any muscle injury or damage to heal.he usual starting dosage of carisoprodol is one 250 mg or 350 mg tablet three times a day and at bedtime.