Alternatives to Pyridostigmine If You Can't Fill Your Prescription

Pyridostigmine (Mestinon) is the first-line symptomatic treatment for myasthenia gravis (MG) and is also used off-label for conditions like POTS. But what happens when you can't get it? Supply shortages of the 180 mg extended-release formulation have left some patients scrambling for alternatives.

This guide covers the main alternatives, both within the same drug class and beyond. Important: Never stop or change your medication without talking to your neurologist or prescriber first. Myasthenia gravis is a serious condition, and medication changes must be carefully managed.

Option 1: Switch to Pyridostigmine IR 60 mg Tablets

The most practical first step is not switching medications at all — but switching formulations. The immediate-release (IR) 60 mg tablets are generally more available than the 180 mg ER tablets and are significantly cheaper (as low as $26 with a GoodRx coupon for 90 tablets).

The IR tablets require more frequent dosing (typically every 3–6 hours while awake) compared to the ER tablets (once or twice daily). Your neurologist can work out an equivalent dosing schedule. Some patients actually prefer the IR tablets because they allow more flexible timing around their daily activities.

Option 2: Neostigmine (Prostigmin)

Neostigmine is the closest pharmacological relative to Pyridostigmine. It works through the same mechanism — inhibiting acetylcholinesterase — but has some important differences:

Shorter duration of action: Neostigmine works faster but doesn't last as long, requiring more frequent dosing.

More GI side effects: Neostigmine typically causes more nausea, cramping, and diarrhea than Pyridostigmine at equivalent doses.

Mainly IV/IM in the U.S.: Neostigmine is mainly used in hospital settings in the U.S. Oral neostigmine (Prostigmin) tablets exist but are rarely used today due to Pyridostigmine's superior profile for chronic management.

Dosing equivalence: approximately 30 mg oral Pyridostigmine corresponds to 1 mg IV neostigmine. Your neurologist can convert doses if a hospital-based transition is needed.

Option 3: Corticosteroids (Prednisone, Methylprednisolone)

When cholinesterase inhibitors alone don't provide adequate control — or when they're unavailable — corticosteroids are the most common next step for myasthenia gravis. Prednisone suppresses the immune system, reducing the production of the antibodies that attack neuromuscular receptors.

An important caveat: when starting corticosteroids in MG patients, there can be a temporary worsening of weakness before improvement occurs. This is why the transition requires close monitoring by a neurologist. Approximately 66–85% of MG patients respond well to corticosteroids.

Option 4: Azathioprine (Imuran)

Azathioprine is an immunosuppressant commonly used as a long-term steroid-sparing agent in MG. It takes 6–12 months to show its full effect, so it's not a quick substitute for Pyridostigmine during a shortage. However, if you're already considering long-term disease modification, this may be a discussion worth having with your neurologist.

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Option 5: Newer Biologics for Generalized MG

For patients with generalized, anti-acetylcholine receptor antibody-positive myasthenia gravis who have inadequate control on standard therapies, newer biologics offer additional options:

Efgartigimod alfa (Vyvgart): An FcRn inhibitor that reduces harmful antibody levels; administered as an IV infusion every 1–2 weeks. FDA-approved for generalized MG in anti-AChR antibody-positive adults.

Eculizumab (Soliris) / Ravulizumab (Ultomiris): Complement inhibitors approved for refractory generalized MG in anti-AChR antibody-positive patients. These are expensive specialty medications used for severe or treatment-resistant cases.

Rituximab (off-label): A B-cell depleting antibody used off-label, particularly for MuSK antibody-positive MG that is refractory to standard therapy. Can induce sustained remission in some patients.

These biologics are not drop-in substitutes for Pyridostigmine during a brief shortage — they are disease-modifying agents for long-term treatment. But if you've been struggling with MG control, now may be the right time to ask your neurologist whether you're a candidate.

Alternatives for POTS Patients

Pyridostigmine is used off-label for POTS (postural orthostatic tachycardia syndrome), where it helps reduce upright heart rate by improving autonomic function. If Pyridostigmine is unavailable, other POTS treatments your doctor may consider include:

Fludrocortisone (Florinef): Increases blood volume and reduces POTS symptoms in some patients.

Midodrine: An alpha-1 agonist that raises blood pressure; commonly used in POTS.

Beta-blockers (propranolol, metoprolol): Slow the heart rate response in hyperadrenergic POTS.

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Talk to Your Doctor — Don't Switch on Your Own

The alternatives above require medical supervision, appropriate dosing, and monitoring. If you're having trouble filling your prescription, the first call you make should be to your neurologist — and the second should be to try the pharmacy-search tools in our in-stock guide.