Dosing and concentration
Why the percentage matters
A percentage on a nasal bottle describes concentration, not the amount delivered by one spray.
• A 0.1% weight/volume solution contains 1 mg per mL, or 1,000 micrograms per mL.
• A 1% solution contains 10 mg per mL, or 10,000 micrograms per mL.
The second solution is ten times as concentrated. The decimal point is therefore an important part of the label.
Reported medical-use amounts
The Russian medical reference for 0.1% nasal drops describes 400–900 micrograms per day over 3–5 days for prevention of mental fatigue. This is a description of that medical-use reference, not an instruction for an unidentified bottle or a injection under the skin.
Other neurological indications have different schedules. A larger amount used in stroke care is not an escalation target for someone seeking better concentration.
From concentration to an amount
For a liquid, the calculation is concentration multiplied by delivered volume.
If a device is documented to deliver 0.05 mL, a 1 mg/mL solution contains 0.05 mg—or 50 micrograms—in that volume. At 10 mg/mL, the same volume contains 500 micrograms.
These are calculation examples, not dosing recommendations. They do not establish that your dropper or pump delivers 0.05 mL. Use its documented output rather than assuming all sprays or drops are the same size.
What to record
Record the exact peptide, concentration, delivery device, documented amount per spray or drop, number administered and time. “Two sprays” alone leaves out the information needed to understand the amount.
A bottle’s total peptide content also is not a single dose. Keep total milligrams in the bottle separate from micrograms per administration.
Preparation and reconstitution
Ready-made nasal solutions
A formulated nasal solution is already prepared. Do not add bacteriostatic water to a ready-made bottle unless its own instructions specifically require it. Adding liquid changes the concentration and may change the formulation’s preservative balance and suitability for nasal tissue.
Check whether the bottle uses a dropper or a metered spray. Retain the supplied device and its directions; replacing it can change the amount delivered.
Lyophilised Semax
Lyophilised means freeze-dried. Adding liquid to a lyophilised peptide is called reconstitution. Dissolving the peptide, however, is only one part of preparing a medicine suitable for a particular route.
A nasal preparation needs a suitable liquid base, acidity, concentration, container and delivery device. Its preservative and after-opening storage instructions also matter. A laboratory vial and an empty spray bottle do not supply all of that information.
Where bacteriostatic water fits
Bacteriostatic water contains a preservative, commonly benzyl alcohol, that limits the growth of some microorganisms. It does not sterilize contaminated material.
It is not automatically the appropriate liquid for a nasal Semax preparation. Water specified for preparing one injectable product should not be assumed suitable for the nose. The preparation instructions must identify a route-compatible liquid and the required volume.
Check the finished preparation
Confirm the final concentration, device output, opening or preparation date, and discard instructions. Keep this information together on the container or in the vial record.
Do not interpret a clear-looking liquid as proof that it is sterile or chemically stable. A concentration calculation can check the arithmetic; it cannot establish the quality of the preparation.
Administration
Nasal drops and sprays
Use the technique for the supplied device. Drops and metered sprays differ in how they deliver liquid, so instructions about priming, head position and cleaning should come from that device’s directions.
Keep the tip clean, avoid sharing the bottle, and replace its cap after use. Avoid touching the tip to unclean surfaces. Do not change the pump or dropper without checking whether the delivered volume changes.
If the nose is irritated, bleeding or significantly blocked, seek advice before continuing. Do not compensate for an uncomfortable or poorly delivered administration by repeatedly adding more.
Other nasal medicines
Record other sprays or drops being used, including their timing. Nasal congestion, another medicine and changes in technique can all affect how an administration feels. This helps a clinician review irritation without assuming the peptide itself is the only possible cause.
What about injections?
Nasal and injected Semax do not have interchangeable amounts. A nasal preparation belongs in the nose, never in a syringe. Changing the route requires a separate preparation and treatment plan.
This nasal guide does not establish a preferred injection site or an injection regimen for Semax.
Oral, nasal and SubQ routes
Oral: the digestive barrier
Swallowed peptides encounter digestive enzymes that can break their chains into smaller pieces. The intestinal lining also limits the passage of many intact peptides into the blood.
Bioavailability describes the proportion of an administered amount that reaches the circulation unchanged. Surviving stomach acid is only one step; a peptide still has to cross the intestinal lining.
Nasal: avoiding the stomach first
Nasal delivery places the preparation against the lining of the nose. Some liquid may be swallowed, and absorption can vary with formulation and delivery. The route does not guarantee that all of the peptide reaches the blood or the brain.
SubQ: a separate route
SubQ means beneath the skin, in fatty tissue. It avoids initial digestive breakdown but still requires absorption from the injection site. It is not interchangeable with nasal delivery on a milligram-for-milligram basis.
Could an oral preparation act directly on the gut?
Local contact with the gut can be relevant for medicines intended to act on intestinal tissue. That does not explain Semax’s proposed effects on attention or memory. For those goals, an oral preparation needs evidence of relevant delivery and outcomes, rather than simply being described as a gut-active alternative.
Half-life
A dependable half-life for nasal Semax is not available. How long you feel an effect is not a measurement of how quickly the peptide leaves your body.
Storage
The Russian reference for the 0.1% nasal-drop preparation specifies refrigeration at 2–8°C. Keep that instruction attached to the particular preparation; it does not establish the stability of every spray, derivative or lyophilised vial.
Keep the original label and record when a nasal bottle was opened. Follow its own after-opening and discard instructions. A generic “30 days after mixing” rule is not a demonstrated Semax storage interval.
For lyophilised material, use the documented temperature, light and moisture instructions. Do not transfer the storage directions for a ready-made nasal liquid to the powder.
Avoid assuming that freezing or re-refrigerating a bottle extends its usable life. If storage conditions were lost during travel, obtain advice for that preparation rather than resetting its opening date.
Contraindications and precautions
Russian medical references list pregnancy, breastfeeding, acute psychiatric conditions, anxiety-associated disorders and a seizure history among contraindication contexts. A previous serious reaction to the peptide or its ingredients also requires medical review.
If you have a neurological or psychiatric condition, involve the clinician treating it. Semax does not replace seizure medication, psychiatric care or stroke rehabilitation. Children need specialist assessment rather than a smaller version of an adult routine.
Bring a complete medicine and supplement list, including stimulants and other nootropics. The absence of a reported interaction is not proof that a combination is safe.
Side effects and combinations
Nasal irritation is one practical concern. Record any new discomfort, headache, sleep disruption or agitation with its timing and preparation. Some of these are symptoms worth tracking rather than established reactions with a known frequency.
If symptoms persist or worsen, stop experimenting with additional products and seek medical advice. Difficulty breathing, throat swelling or fainting after administration needs emergency care.
Do not mix Semax and Selank in one bottle without formulation-specific instructions. Using both also makes it harder to identify the cause of a benefit or side effect. Record each separately and review the combination before adding it.