Orexin-A Injection Guide

Subcutaneous vs. Intramuscular Injection

SubQ injection deposits peptide into fatty tissue (adipose layer beneath skin), allowing slow, steady absorption. IM injection deposits directly into muscle, producing faster absorption and peak levels. For daily use, SubQ is preferred: less tissue damage, easier self-administration, consistent absorption, and reduced infection risk. IM is useful for once-weekly dosing but causes more muscle soreness.

Injection Site Selection and Rotation

Common SubQ sites: abdomen (most common, fatty, easy to reach), lateral thigh (easy for self-injection), upper arm (posterior triceps area, less convenient for self-injection). Rotate sites to prevent lipohypertrophy (fatty nodules), fibrosis, and injection-site reactions. A typical rotation: abdomen Monday-Wednesday, left thigh Thursday-Friday, right thigh Saturday-Sunday.

Needle Size and Injection Technique

Use 29-31 gauge insulin needles for SubQ (0.5-1 mL insulin syringe) or 25-27 gauge for IM (1-3 mL syringe). Sterilize skin with 70% alcohol prep, let dry 30 seconds. Pinch skin (SubQ) or locate muscle (IM), insert needle at 45° angle (SubQ) or 90° angle (IM). Inject slowly over 3-5 seconds. Withdraw needle, apply light pressure, do not massage (can cause bruising or uneven absorption).

Dosing: Starting Amount and Adjustments

First-time users: start 0.5-1 mg, observe response for 3-5 days before adjusting. Most effective dose: 1-3 mg daily. Doses above 3 mg provide no additional benefit and increase side effects. Women typically use 0.5-2 mg; men 1-3 mg. Adjust dose based on response and side effects, not a fixed protocol. Some use 2 mg weekdays, 1 mg weekends (cycling).

Timing Relative to Activities and Sleep

Inject 6-10 AM (morning optimal) or 12-2 PM (early afternoon). Never inject after 4 PM (sleep suppression risk). For training: inject 1-2 hours before training to hit peak effects during workout. For cognitive work: morning injection provides all-day baseline elevation. For sleep optimization: inject morning; allows 12-16 hours for clearance before bedtime.

Preparation of Orexin-A Solution

Orexin-A is supplied as freeze-dried powder. Reconstitute with sterile sodium chloride (0.9%) or bacteriostatic water at desired concentration. Example: 5 mg vial + 5 mL diluent = 1 mg/mL solution. Use sterile technique; swab vial top with alcohol, allow to dry, inject diluent slowly. Gently swirl to dissolve (do not shake vigorously—avoid foaming). Solution is stable refrigerated 2-4 weeks; frozen (3-6 months).

Storage and Stability

Store reconstituted Orexin-A refrigerated (2-8°C) in darkness (light-sensitive peptide). Do not freeze reconstituted solution (causes denaturation). Freeze-dried powder is stable room temperature 1-2 years; refrigerated is indefinitely stable. Use insulin syringe and syringe tip cap for daily withdrawal if storing multiple weeks; sharps container for disposal.

Sterile Injection Protocol

Wash hands thoroughly. Swab injection site with 70% alcohol prep, let air dry completely. Swab vial top if withdrawing from multi-dose vial. Use new sterile needle/syringe for each injection (never reuse). Inject slowly, withdraw needle, apply pressure with sterile gauze 10-15 seconds. Dispose of sharps in sharps container; never in regular trash.

Managing Injection Site Reactions

Minor bruising, redness, mild swelling (1-2 hours) are normal. Apply ice immediately post-injection to reduce bruising. Rotate sites strictly to avoid repeated trauma to same location. If persistent swelling, warmth, or pus develops, seek medical attention (infection). Lipohypertrophy (fatty lumps) develops with repeated injections to same site; prevent through strict rotation.

Signs of Proper Injection

Success indicators: visible subcutaneous 'tent' of skin (SubQ confirmation), slow solution absorption (should be invisible within 30 seconds for SubQ), no solution dripping back out of needle tract, no significant discomfort. If solution leaks out, re-inject at different site. Minimal bleeding is normal; significant bleeding suggests vascular puncture (rare).

Common Injection Mistakes to Avoid

Not rotating sites (lipohypertrophy), injecting while needle is moving (trauma, bruising), injecting too quickly (increased pressure, leakage), using dull needles (pain, tissue damage), not allowing alcohol to dry (stinging, reduced effectiveness), injecting at wrong time of day (sleep interference), and reusing needles (infection risk).

When to Seek Medical Attention

Persistent swelling/warmth/redness lasting >24 hours, signs of infection (pus, systemic symptoms), severe pain at injection site, unusual symptoms post-injection (severe chest pain, difficulty breathing, severe dizziness). These warrant immediate medical evaluation.

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