Medical note: This is general education, not personal medical advice. ED can be related to cardiovascular disease, diabetes, medication effects, mental health, neurologic disease and other conditions. Persistent or new ED deserves appropriate medical evaluation.
In This Article
- After spinal cord injury, the level and completeness of the injury shape which kind of erection is still possible: reflex (touch-triggered) or psychogenic (thought-triggered).
- The Reeve Foundation describes PDE5 pills as the most effective option for most SCI types, except cauda equina and conus medullaris injuries.
- Injections, intraurethral medication, vacuum devices, constriction rings and implants are all used; rings should not stay on longer than 30 minutes.
- Sexual stimulation can trigger autonomic dysreflexia in men with higher injuries, so have an AD plan before you start, and talk to your SCI team about how it fits with ED medication.
A spinal cord injury changes a lot of things at once, and sexual function is one that many men are afraid to ask about. The good news is that most men with SCI have some erectile function, and many treatment options work well. The important differences are in which type of erection your injury still allows and in one safety issue, autonomic dysreflexia, that men without SCI don't have to think about.
This guide summarizes how SCI affects erections and how each treatment fits. It's general information. Your rehabilitation physician or urologist will tailor it to your injury.
Two pathways to an erection
Erections can be triggered in two main ways, and spinal cord injury can disconnect one while sparing the other. The Christopher & Dana Reeve Foundation describes them like this:
| Type | Triggered by | Linked to |
|---|---|---|
| Reflex (reflexogenic) erection | Direct touch or stimulation of the genitals | Upper motor neuron injury, roughly T10 and above. The reflex circuit in the lower cord is intact even though brain signals can't get through |
| Psychogenic erection | Thoughts, sights, sounds and other mental arousal | Lower motor neuron injury, roughly T11 and below, where the brain's pathway can still work but the lower reflex arc is damaged |
| Spontaneous erection | A full bladder, or during sleep | Doesn't require intact spinal pathways |
Incomplete injuries can preserve some of both. A common experience with reflex erections is that they come readily with touch but don't last long enough, or fade when stimulation stops. That pattern is one reason treatments that help maintain an erection are so useful after SCI. For background on the mechanics, see our erection explainer.
ED pills (PDE5 inhibitors)
The Reeve Foundation calls PDE5 inhibitors, such as sildenafil (Viagra), the most effective treatment for most types of SCI, with the exception of cauda equina and conus medullaris injuries. These drugs strengthen reflex erections, which is why they're often the first thing tried.
Important points:
- They still need stimulation to work. For many men with SCI that means direct genital touch rather than mental arousal.
- Low blood pressure is a concern for men with higher injuries, who often have low resting pressure already. Dizziness when sitting up or transferring is worth reporting before starting a PDE5 inhibitor.
- PDE5 inhibitors can't be combined with nitrates in any form. The Reeve Foundation lists this. See the AD section below for why this matters especially after SCI.
The AUA's ED guideline also notes that doses of PDE5 inhibitors should be titrated to the best effect, and that men should get instructions on how to use them correctly. Our dosage guide explains how titration works in general.
Autonomic dysreflexia: the safety issue to plan for
Autonomic dysreflexia (AD) is a sudden, dangerous spike in blood pressure that can affect people with higher-level injuries. The Reeve Foundation notes that sexual stimulation, including vibration, can trigger it. If you notice AD symptoms such as a pounding headache, flushing or sweating above the injury, or a rising blood pressure reading, stop sexual activity and follow your AD plan.
There's an important conflict to sort out ahead of time. Nitrate paste or other nitrates are sometimes used to treat AD episodes, and the Reeve Foundation mentions nitro paste as an AD option. But nitrates are absolutely contraindicated with PDE5 inhibitors because the combination can crash blood pressure. If you use or plan to use an ED pill, ask your SCI physician directly which AD treatment you should use on days you've taken it, and make sure caregivers know too. Our article on why nitrates are an absolute contraindication explains the interaction.
Your physician may also recommend medication before sex if AD is a recurring problem.
Injections and intraurethral medication
Penile injections deliver alprostadil or a combination of papaverine and phentolamine directly into the side of the penis. The Reeve Foundation says the erection typically forms within 5 to 10 minutes and lasts about an hour. Because injections don't rely on nerve signals, they can work when pills don't, including after lower cord injuries. The main risk is priapism (an erection that won't go down), which needs emergency treatment. Doses are set in the clinic. See our penile injections guide.
Intraurethral alprostadil is a small pellet placed in the urethra. The Reeve Foundation notes it's less effective than injections, and it's often used with a constriction ring.
Vacuum devices and constriction rings
A vacuum device uses a cylinder and pump to draw blood into the penis, and a ring at the base holds it there. Rings can also be used alone to help keep a reflex erection from fading.
- The 30-minute rule: the Reeve Foundation warns not to leave a ring on for more than 30 minutes, to avoid damage to the penis.
- Check skin carefully. Reduced sensation means you may not feel pinching, bruising or a ring that's too tight. Check visually.
- Use a medically appropriate device. The Reeve Foundation cautions that unregulated devices can cause injury.
Our guide to vacuum erection devices covers technique in more detail.
Implants and other options
A penile implant, either inflatable or semi-rigid, is surgically placed and allows an erection whenever wanted, independent of nerve function. It's usually considered after other options haven't worked, and infection risk and skin integrity are especially important considerations after SCI.
The Reeve Foundation also mentions functional electrical stimulation and, for cauda equina and conus medullaris injuries, nerve transfer surgery in selected cases. These are specialized options to discuss with an SCI center.
Sex after SCI is more than erections
Many men find that sensation, orgasm and intimacy change in ways that pills and devices don't address. Rehabilitation programs often include sexual health counseling, and it's worth asking for. Talking openly with a partner helps too. Our partner communication scripts are a starting point. Fertility after SCI is a separate topic with its own specialists, so ask for a referral if it matters to you.
Sources
- Christopher & Dana Reeve Foundation: Sexual Health for Men
- NIDDK: Symptoms & Causes of Erectile Dysfunction
- American Urological Association: Erectile Dysfunction Guideline (2018)