Enalapril vs Thymosin Beta-4
The blood pressure champion that helped millions breathe easier and live longer
The body's natural healing peptide that accelerates tissue repair and reduces inflammation
Written by Michael Carroll — Owner, Director of Research · Reviewed by the Peptide Initiative Research Team · Editorial standards
Quick comparison
Dose range
Enalapril
10–20 mg/day
Thymosin Beta-4
2–5 mg
Frequency
Enalapril
Once daily
Thymosin Beta-4
Twice weekly
Administration
Enalapril
Oral tablet
Thymosin Beta-4
Subcutaneous injection
Cycle length
Enalapril
Ongoing/indefinite
Thymosin Beta-4
8-12 weeks
Onset speed
Enalapril
Moderate (1-2 weeks)
Thymosin Beta-4
Moderate (1-2 weeks)
Evidence level
Enalapril
Strong human trials (Phase 3 or FDA approved)
Thymosin Beta-4
Moderate human trials (Phase 1-2)
Benefit ratings
Cardiovascular Health
Long-term Protection
Quality of Life
Wound Healing
Inflammation Reduction
Tissue Regeneration
Compound specifications
Enalapril
Molecular formula
C20H28N2O5
Molecular weight
376.4 g/mol
Half-life
Enalapril: 1 hour; Enalaprilat (active form): 11 hours effective half-life
Bioavailability
Approximately 60% oral bioavailability when taken by mouth
CAS number
75847-73-3
Thymosin Beta-4
Molecular formula
C212H350N56O78S
Molecular weight
4963
Half-life
Dose-dependent (increases with higher doses)
Bioavailability
100% (subcutaneous and intravenous)
CAS number
77591-33-4
Dosing compared
Enalapril
Oral
2.5–5 mg
Once daily · Titrate over 1–2 weeks
FDA-approved starting dose. For high blood pressure, begin at 5 mg once daily; for heart failure, begin lower at 2.5 mg to avoid a big drop in blood pressure [4].
10–20 mg/day
Once or twice daily · Ongoing
Usual blood-pressure maintenance dose, taken once daily or split into two doses. The dose is raised gradually based on response [4].
40 mg/day
In two divided doses (20 mg twice daily) · Ongoing
Maximum dose. For heart failure the target is 20 mg twice daily; for high blood pressure up to 40 mg/day is the ceiling [4].
Thymosin Beta-4
Subcutaneous injection
2-5 mg (community injectable practice for 'TB-500')
Once or twice weekly · 4-6 week loading phase, then weekly maintenance
Documented community/research-practice injectable dosing for tissue repair; thymosin beta-4 has ~100% bioavailability by the subcutaneous route [1]. Not an FDA-approved use.
Topical ophthalmic (eye drops)
0.1% (1 mg/mL) RGN-259 solution, 1 drop
Several times daily (e.g. up to 5x/day) · 4 weeks
0.1% RGN-259 ophthalmic solution used in phase III neurotrophic keratopathy and dry-eye trials, applied as eye drops several times daily for ~4 weeks [5].
Intravenous injection
450-1200 mg
IV push daily for the first 3 days, then weekly · Total of 7 doses over ~5 weeks
Doses studied in the RGN-352 acute myocardial infarction clinical program, given IV after PCI [6].
Best suited for
Enalapril
Managing hypertension to prevent serious complications
Enalapril is particularly well-suited for individuals focused on managing hypertension to prevent serious complications. Research and clinical experience suggest meaningful benefits in this area when used as part of a comprehensive treatment approach.
Treating heart failure and improving survival rates
Enalapril is particularly well-suited for individuals focused on treating heart failure and improving survival rates. Research and clinical experience suggest meaningful benefits in this area when used as part of a comprehensive treatment approach.
Protecting organs from damage caused by high blood pressure
Enalapril is particularly well-suited for individuals focused on protecting organs from damage caused by high blood pressure. Research and clinical experience suggest meaningful benefits in this area when used as part of a comprehensive treatment approach.
Thymosin Beta-4
Post-Surgery Recovery
Accelerates healing of surgical wounds and reduces post-operative inflammation and scarring
Chronic Wound Management
Helps pressure ulcers, venous stasis ulcers, and other slow-healing wounds progress faster
Tissue Regeneration
Supports repair of damaged tissues from injury, burns, or degenerative conditions
Side effects
Enalapril
Common
- Dry cough
- Dizziness
- Fatigue
- Hyperkalemia
- Angioedema
Serious
- Severe allergic reaction
Thymosin Beta-4
Common
- Injection site redness
- Injection site swelling
Uncommon
- Temporary mild headache
- Mild bruising at injection site
- Transient fatigue
Serious
- Allergic reaction
Safety & evidence
Enalapril
Evidence level
Strong human trials (Phase 3 or FDA approved)
FDA status
FDA approved for this use
Safety overview
Enalapril is an FDA-approved ACE inhibitor with safety data spanning over 40 years of clinical use and post-market surveillance in millions of hypertensive patients. Persistent dry cough occurs in 10-20% of patients, caused by kinase II inhibition and bradykinin accumulation. Hyperkalemia is a serious risk, particularly in renal impairment, diabetes, or concurrent NSAID/potassium-sparing diuretic use—potassium monitoring is essential. Angioedema (0.1-0.2%) is a rare but life-threatening emergency, absolute contraindication for future ACE inhibitor use. Hypotension can occur in volume-depleted patients or those on concurrent vasodilators. Acute kidney injury risk exists in patients with bilateral renal artery stenosis or single kidney. Fetal teratogenicity is well-documented in pregnancy.
Contraindications
- Pregnancy (causes serious fetal harm)
- History of angioedema with ACE inhibitors
- Severe renal dysfunction
- Concurrent use with certain other blood pressure medications
- Potassium supplementation without medical supervision
Thymosin Beta-4
Evidence level
Moderate human trials (Phase 1-2)
FDA status
Research compound
Safety overview
Thymosin Beta-4 is a naturally occurring peptide found in all cells and body fluids in the human body. Clinical trials have demonstrated excellent safety even at very high doses. IV studies showed doses up to 1260 mg were well tolerated with no serious adverse events.
Contraindications
- Active systemic infections
- Severe immunosuppression
- Hypersensitivity to thymosin or any component
- Pregnancy (insufficient safety data)
Which is right for you?
Choose Enalapril if...
- Managing hypertension to prevent serious complications
- Treating heart failure and improving survival rates
- Protecting organs from damage caused by high blood pressure
Choose Thymosin Beta-4 if...
- Recovering from injuries or surgery
- Improving wound healing speed
- Reducing inflammation
- Minimizing scar formation