Miebo Side Effects: What to Expect and When to Call Your Doctor

Miebo (perfluorohexyloctane ophthalmic solution) was designed to be both effective and well-tolerated. Because it is water-free, preservative-free, and does not contain any anti-inflammatory chemicals, it avoids many of the side effects associated with older dry eye treatments. Still, like any medication, it can cause adverse effects. Here's what to expect and how to tell the difference between a normal reaction and something that warrants medical attention.

What Makes Miebo's Safety Profile Unique?

In the GOBI and MOJAVE Phase 3 clinical trials — two double-masked, saline-controlled studies that enrolled more than 1,200 patients — Miebo demonstrated a strong safety record. Over the course of the 57-day trials, there were no incidences of serious ocular adverse events with Miebo. The discontinuation rate due to adverse events was comparable to the control group (0.2% vs. 0.5% pooled), and most adverse events were mild.

Many patients in studies described the feeling of Miebo when first placed in the eye as silky (68.7%), smooth (67.7%), and soothing (65.7%) — a notably different experience from the stinging and burning commonly reported with cyclosporine drops like Restasis.

Common Side Effects of Miebo

The most common side effects observed in clinical trials were:

• Blurred vision (1–3%): Transient blurring may occur immediately after instillation as the eye drop spreads across the ocular surface. This is typically very brief — seconds to a few minutes. Do not drive or operate machinery until your vision clears.
• Eye redness / conjunctival redness (1–3%): Mild redness in the white of the eye can occur. This is usually not serious and may resolve on its own with continued use.

Both of these side effects were reported in fewer than 4% of patients in clinical trials — making Miebo one of the better-tolerated prescription dry eye treatments available.

Serious Side Effects — Know the Warning Signs

Serious side effects are uncommon but possible. The primary serious concern is:

• Hypersensitivity reaction: An allergic reaction to perfluorohexyloctane is rare but possible. Signs include severe eye pain, significant redness, swelling of the eyelids, hives, or difficulty breathing. Miebo is contraindicated in patients with a known hypersensitivity to perfluorohexyloctane.

If you experience any signs of a severe allergic reaction, stop using Miebo immediately and seek emergency medical care.

Important Safety Precautions

• Contact lenses: Do not use Miebo while wearing contact lenses. Remove lenses before instillation and wait at least 30 minutes before reinserting. Miebo's oil-like formula can coat contact lenses and affect their clarity and fit.
• Driving: Because Miebo can temporarily blur vision, avoid driving immediately after instillation until you know how long the visual disturbance lasts for you personally.
• Contamination risk: Although Miebo is water-free (which reduces bacterial growth risk), it comes in a multi-dose bottle. Wash your hands before use and avoid touching the tip of the bottle to your eye, fingers, or any surface.
• Pregnancy and breastfeeding: There are no adequate, well-controlled studies in pregnant women. Discuss with your doctor before using Miebo if you are pregnant or breastfeeding.
• Pediatric use: Safety and efficacy of Miebo have not been established in patients under 18 years old.

When Should You Call Your Doctor?

Contact your eye care provider if:

• Blurred vision is severe, persistent (doesn't clear within a few minutes), or worsening
• Eye redness is increasing rather than improving
• You experience eye pain, swelling, or discharge
• Your dry eye symptoms are not improving after 4–8 weeks of consistent use
• You develop any sign of an allergic reaction: itching, rash, hives, or swelling of the face or throat

Miebo vs. Other Dry Eye Drops: Side Effect Comparison

Compared to other prescription dry eye drugs:

• vs. Restasis/cyclosporine: Restasis commonly causes burning and stinging. Miebo generally does not.
• vs. Xiidra: Xiidra can cause altered taste (dysgeusia). Miebo has no known taste-related effects.
• vs. Tyrvaya: Tyrvaya (a nasal spray) can cause sneezing and nasal irritation. Miebo avoids nasal side effects entirely.

The Bottom Line

Miebo has a favorable side effect profile compared to other prescription dry eye treatments. The most common effects — brief blurred vision and mild redness — are typically transient and mild. If you tolerate Miebo well in the first few days, you're unlikely to develop significant adverse effects later. For information on drug interactions, see our article on Miebo drug interactions.