Caverject 20mcg Injection (Alprostadil)
₨18,000.00
Caverject 20mcg injection contains alprostadil — a synthetic prostaglandin E1 manufactured by Pfizer. It is used for the treatment of erectile dysfunction (ED) in adult men when oral PDE5 inhibitors such as sildenafil (Viagra) or tadalafil (Cialis) have been ineffective or are contraindicated. Caverject is an intracavernosal injection administered directly into the erectile tissue of the penis, producing a reliable erection independent of sexual stimulation. Online Pharmacy stocks original Pfizer Caverject with cold-chain delivery and completely discreet plain packaging.
Product Description:
Brand: Caverject
Packet Size: 1’s Injection
Active ingredient: Alprostadil
Manufacturer: Pfizer
Treatment: Erectile Dysfunction
✓ Medically reviewed by
Dr. Irfan Zia
Pharm.D · DRAP Reg. No. 1921245 · Reviewed March 2026
This product has been reviewed and approved by our DRAP-registered pharmacist for clinical accuracy. All medicines on onlinepharmacy.pk are authentic and sourced from licensed suppliers.
Additional Details
When is Caverject prescribed?
Caverject is typically prescribed by a urologist or sexual medicine specialist in the following situations:
- Oral ED medicines (PDE5 inhibitors) are not effective — approximately 30% of men with ED do not respond adequately to Viagra or Cialis
- Oral ED medicines are contraindicated — e.g., in men taking nitrates for heart disease
- Following radical prostatectomy or pelvic surgery where nerve-sparing was not possible
- Severe vascular or neurological erectile dysfunction where oral medicines have limited efficacy
- Men who prefer an on-demand injectable option for more predictable results
Caverject produces an erection within 5 to 20 minutes and the erection typically lasts 30 to 60 minutes — regardless of sexual stimulation.
How Caverject works
Alprostadil (prostaglandin E1) relaxes the smooth muscle in the corpora cavernosa — the erectile tissue in the penis. This relaxation allows blood to flow into the cavernous tissue, producing an erection. Unlike oral PDE5 inhibitors which require nitric oxide signalling and sexual stimulation, alprostadil acts directly on smooth muscle receptors, making it effective even in men with neurological or severe vascular causes of ED.
Dosage and how to use Caverject
Important: The injection technique must be taught and demonstrated by your urologist or trained nurse before self-administration. Do not attempt self-injection without prior training and medical guidance.
- The starting dose (typically 2.5–5 mcg) is determined by your urologist during a clinic visit
- The dose is titrated upward at clinic visits until an adequate erection of 30–60 minutes is achieved
- Inject into the side of the penis (corpora cavernosa) — avoid veins, the underside, and the tip
- Erection typically occurs within 5–20 minutes of injection
- Maximum recommended frequency: once in 24 hours, no more than 3 times per week
- If erection persists beyond 4 hours (priapism), seek immediate medical attention — this is a medical emergency
Side effects
Common: mild penile pain at the injection site (typically brief and well-tolerated), prolonged erection. Serious but uncommon: priapism (erection lasting more than 4 hours — requires emergency treatment), penile fibrosis with very long-term use (reduced with correct injection technique and dose limits). Minor bruising at injection site.
Who should not use Caverject?
- Men with a known hypersensitivity to alprostadil
- Men with conditions predisposing to priapism (sickle cell anaemia, multiple myeloma, leukaemia)
- Men with penile implants or anatomical deformity that would make injection unsafe
- Not for sexual activity with partners who are or may become pregnant (prostaglandins can cause uterine contractions)
- Not combined with other vasoactive ED treatments
Storage and cold-chain requirements
- Before reconstitution: store below 25°C, away from direct sunlight — or 2–8°C if more convenient
- After reconstitution: use immediately or within 24 hours if stored at 2–8°C
- Do not freeze the reconstituted solution
- Online Pharmacy dispatches Caverject in cold-chain packaging to maintain product stability throughout delivery
Why buy Caverject from Online Pharmacy?
- Original Pfizer Caverject — not a substitute or alternative brand
- Completely discreet plain outer packaging — no pharmacy name or product indication on the outer box
- Cold-chain delivery maintained throughout dispatch nationwide
- Pharmacist prescription verification before every order — responsible dispensing
- Free confidential pharmacist consultation by phone or WhatsApp
- Same-day delivery in Karachi, 1–2 days to Lahore and Islamabad, 2–4 days nationwide
Medical disclaimer: For educational purposes only. Caverject must be prescribed and its use initiated and trained by a registered urologist. Do not self-inject without prior training. Erection lasting more than 4 hours requires immediate emergency medical attention. Emergency: 1122.
Recommended Dosage of Caverject 20mcg Injection
The minimum dosage of Caverject needed to alleviate erectile dysfunction depends on the person’s weight. Talk with your doctor about the right Caverject dose, and your doctor will conduct checks on your doses. The starting dose starts from 1.25 to 2.5 micrograms.
Most men find that a dose of 5 to 20 micrograms is suitable, but some may require a higher dose. To reduce the risk of a prolonged and painful erection, your doctor will prescribe the lowest effective dose.
It’s important to note that you should never use more than 60 micrograms. If Caverject is being used for diagnostic purposes to understand the cause of your erectile dysfunction, the dose will usually be between 5 and 20 micrograms. We recommend following your doctor’s advice closely to ensure safe and effective treatment.
Warnings and Precautions
Warnings:
Be aware if you’re allergic to alprostadil or any other ingredients in this medication.
If you have conditions like sickle cell anemia, leukemia, multiple myeloma, or any issue that increases the risk of “priapism” (a painful, prolonged erection), please be cautious.
Avoid using Caverject if you have a penile implant.
If you have a medical condition, such as severe heart disease, where sexual activity is advised against, do not use this medication.
Do not use Caverject if your penis is scarred or not straight, or if you have a tight foreskin.
Precautions:
Discuss with your doctor, pharmacist, or nurse before using Caverject if you:
Have lung, chest, or heart disorders. In such cases, also exercise caution when engaging in sexual activity.
Have a history of mental illness or addiction.
Have experienced a mini-stroke (transient ischemic attack).
Have one or more cardiovascular risk factors, which might include high blood pressure, tobacco use, high blood glucose, high blood cholesterol, being overweight or obese.
Having high risks like heart strokes, high blood pressure, high cholesterol, coronary artery disease, heart arrhythmia, or diabetes.
Remember, before using Caverject injection, your safety and well-being come first, and talk with your doctor by considering all precautions for your health safety.
Possible Side Effects of Caverject Injection
Before using Caverject injection, talk with your doctor about any potential side effects.
Reactions at the injection site, such as mild to moderate pain, irritation, or slight bleeding.
Although reactions at the injection site can occur, such as mild to moderate pain, irritation, or slight bleeding.
Unusual discharge from your penis.
Pain in your penis, urethra, or testicles.
Headache.
Back pain.
A rash on the skin of your penis.
Itching, warmth, or numbness of your penis.
Cough.
Stuffy nose.
Symptoms of a cold.
Flu-like symptoms.
If you encounter less common but serious side effects such as redness, tenderness, swelling of the penis, lumps, or an unusual curving of the penis, it’s important to tell your doctor right away. Your doctor will tell you about each aspect and side effects of the Caverject injection.
Can We Use Other Medicines with Caverject 20mcg Injection?
If you’re considering using Caverject 20mg Injection, First talk with your doctor about taking Caverject injection with other over-the-counter medicines, especially.
Medicines for high BP, like antihypertensives.
Medicines for respiration and heart diseases, like (sympathomimetics).
Medicines that can open your blood vessels, like vasodilative agents.
Other medications for erectile dysfunction, such as sildenafil or papaverine.
Blood thinners like warfarin or heparin, can increase your risk of bleeding when you do the injection.
Can Alcohol Drinker Take Caverject Injection?
It’s important to discuss with your doctor before drinking alcohol while taking Caverject. Discuss your doctor’s advice about any potential side effects with alcohol or other substances for your health safety.
Can You Take Caverject Injection If You’re Pregnant?
Most couples use Caverject when they are looking to conceive, and it’s safe to use if your partner is pregnant or breastfeeding. It’s important to note that Caverject doesn’t fulfills any protection against pregnancy. Therefore, if you wish to avoid pregnancy, you should use a reliable form of contraception.
Qasim –
Highly effective and custom service was very helpful !
Ahmed –
Fast delivery and excellent customer service from the Online pharmacy.
A. Hashmi –
Prescribed Caverject by my urologist. Most local pharmacies in Karachi did not have it in stock. Online Pharmacy had it available, the pharmacist verified my prescription before processing, and delivery arrived in completely plain packaging with no indication of contents. Professional handling throughout.
M. Siddiqui –
Ordered following a specialist prescription. The pharmacist called to confirm the correct strength and prescription details before dispatching. Product arrived as original Pfizer Caverject, cold-chain maintained, intact seal. Plain outer packaging. First order here and the experience was straightforward and professional.
R. Ahmed –
Caverject is not commonly found in Islamabad pharmacies. Online Pharmacy had it available and delivered within 2 days. Cold-chain packaging was in good condition and the product matched the Pfizer batch information. Happy with the service overall.
T. Khan –
Second order for Caverject from Online Pharmacy. Both times the prescription was properly verified, product is original Pfizer, and the outer packaging is completely plain. The pharmacist is professional and helpful when I have had questions. Good service for a specialised prescription medicine.
F. Mirza –
Had some questions before placing my first order. The pharmacist on WhatsApp was patient, knowledgeable, and answered everything clearly. Received original product in intact cold-chain packaging. The whole process from enquiry to delivery was handled professionally. Will continue ordering from here.