5-alpha-reductase inhibitor (type II)
Finasteride with antacids and acid blockers
Antacids and acid-blocking medications (PPIs like omeprazole, H2 blockers like ranitidine or famotidine) are widely used and can subtly affect the absorption of medications taken alongside them. For Finasteride (Finasteride) at 1mg, the impact depends on how Finasteride is absorbed and whether gastric pH plays a role.
How antacids affect Finasteride
Antacids work locally to neutralise gastric acid; PPIs and H2 blockers reduce acid secretion over hours. Some medications need an acidic stomach for proper dissolution and absorption — for these, co-administration with PPIs reduces effective dose. Other medications absorb fine regardless of pH. Whether Finasteride is pH-sensitive is in the prescribing information. Finasteride binds with high affinity to 5-alpha-reductase type II, blocking the conversion of testosterone into DHT.
Practical guidance
According to general pharmacy practice, separating antacid doses from Finasteride by 2 hours avoids most direct binding interactions. PPIs and H2 blockers, taken on their own schedule, do not need timing separation but can shift Finasteride absorption over weeks of co-use. The pharmacist confirms whether Finasteride at 1mg is affected.
Frequently asked questions
Can I take antacids with Finasteride? ▾
Yes for most users, but separating the doses by 2 hours minimises any direct interaction with Finasteride at 1mg. Some medications bind to antacid components and absorb less effectively if taken simultaneously.
Will my PPI affect Finasteride? ▾
For most 5-alpha-reductase inhibitor (type II) medications, no clinically meaningful interaction. For pH-sensitive active ingredients, chronic PPI use can reduce absorption of Finasteride; the prescriber may consider an alternative or a dose adjustment if this applies to Finasteride.
Products containing Finasteride
More on Finasteride
- With alcoholFinasteride and alcohol — is it safe to drink?
- With foodShould Finasteride be taken with food?
- Side effectsFinasteride side effects: common, rare and warning signs
- Dosage guideFinasteride dosage guide: how much to take and when
- OnsetHow fast does Finasteride start working?
- DurationHow long does Finasteride last?
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