Could oral sudafed reduce brain inflammation/irritation?

No. Sudafed decreases swelling of mucous membranes in the nose.. It would be ineffective reducing swelling in the brain.

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Can oral sudafed (pseudoephedrine) reduce brain inflammation/irritation?

Be careful. Sudafed is an upper. It can be converted to a methamphetamine in drug expert hands. Used cautiously it is a good decongestant. Used in excess it will cause stress on the heart. Read more...