What is the use and safety of sildenafil in pregnancy?
Sildenafil is studied in pregnancy mainly for pulmonary hypertension; its safety is not fully established and it needs specialist supervision.
What is the use and safety of sildenafil in pregnancy? Sildenafil — the drug best known as Viagra for erectile dysfunction — has been studied in pregnancy mainly for pulmonary arterial hypertension, and researchers have also explored it for fetal growth problems. But its safety in pregnancy is not fully established, and some studies have raised concerns. It should only ever be used in pregnancy under close specialist supervision. Here is a careful overview of sildenafil in pregnancy.
Sildenafil beyond erectile dysfunction
Although sildenafil is famous for treating erectile dysfunction in men, the same molecule has other medical uses. Under the brand Revatio, it is used to treat pulmonary arterial hypertension (high blood pressure in the lungs' arteries). Because it relaxes blood vessels, sildenafil has clinical roles wherever improving blood flow is beneficial — and that is the starting point for its investigation in pregnancy.
Why sildenafil is considered in pregnancy
In pregnancy, sildenafil has two main areas of interest. First, women with pulmonary arterial hypertension may need treatment during pregnancy, which requires careful monitoring. Second, researchers have studied whether sildenafil, by improving blood flow to the placenta, might help in cases of severe fetal growth restriction. This is an expanding field of study — but "under study" is very different from "proven safe."
Risks and concerns
Safety is the central issue. Studies have examined possible risks, including preterm birth and low infant birth weight, and some research has raised significant concerns about fetal safety. Animal studies (in pregnant rats and rabbits) have looked at teratogenicity, embryotoxicity, and fetotoxicity. The overall human picture includes important knowledge gaps, which is precisely why sildenafil is not casually used in pregnancy.
Sildenafil in pregnancy at a glance
| Aspect | Status |
|---|---|
| Pulmonary hypertension in pregnancy | Used under specialist care |
| Fetal growth restriction | Researched, not established |
| Overall safety | Not fully established; concerns raised |
| Self-use in pregnancy | Not appropriate |
Monitoring and supervision
Where sildenafil is used in pregnancy — for example, for pulmonary arterial hypertension — it is done with careful safety measures: specialist-led care, hospital birth, close monitoring of mother and baby, and ongoing assessment of blood pressure and fetal growth. This intensive supervision reflects both the seriousness of the conditions involved and the uncertainty around the drug's effects during pregnancy.
The key message
Sildenafil is not a general-purpose or self-prescribed medicine in pregnancy. Its use is limited to specific medical situations, decided and monitored by specialists, with risks and benefits weighed case by case. Anyone who is pregnant, or planning pregnancy, and taking or considering sildenafil for any reason should discuss it with their doctor. For the more familiar use of sildenafil, see how sildenafil works for ED.
Frequently asked questions
- Is sildenafil safe in pregnancy?
- Its safety is not fully established, and some studies have raised concerns. It is used only under specialist supervision.
- Why would it be used in pregnancy?
- Mainly for pulmonary arterial hypertension; it has also been researched for severe fetal growth restriction.
- Can it help a baby grow?
- This has been studied but is not established; it is not a proven or routine treatment.
- Should I take it on my own in pregnancy?
- No. Any use in pregnancy must be decided and monitored by a specialist.
For more on every topic, return to the erectile dysfunction guide.