Semax side effects and what's normal

Most side effects of Semax are mild and temporary. Here is what is common, and when to reach out.

Common and usually temporary

• Nasal irritation, dryness, or a runny nose
• Headache
• Feeling restless, or having trouble sleeping, if you use it late in the day. Many people use it in the morning.

What is not known yet

Semax has been studied mostly in the lab, in animals, and in clinical research outside the US. Its long-term safety in people isn't established, and the full range of possible side effects is not yet known. If you notice something that is not on the list above, tell us rather than assuming it is normal.

Contact us if

• A side effect is severe, persistent, or getting worse instead of better
• Anything feels wrong enough that you are unsure about your next dose

For signs of an allergic reaction, such as a rash, swelling, or trouble breathing, get medical care right away. If you are having trouble breathing, call 911 or go to the ER. Then let us know.