Sunosi and Modafinil both come up in conversations about treating excessive daytime sleepiness, and they’re often compared head to head in international content.
What Each One Is
Modafinil
Modafinil, which in Australia has a Schedule 4 listing, is approved for excessive daytime sleepiness due to narcolepsy, obstructive sleep apnoea, and shift work sleep disorder. The drug has a long history of clinical use and is available easily with prescriptions from a GP doctor or specialist.
Sunosi
Sunosi is the brand name of solriamfetol, a double dopamine and norepinephrine reuptake inhibitor, approved for the treatment of narcolepsy and obstructive sleep apnoea related excessive daytime sleepiness in foreign countries. The mechanism of action is quite different from that of Modafinil, if we compare Sunosi to Modafinil and taking Modafinil’s wakefulness effects that are not thoroughly understood into account, then Sunosi will inhibit the reuptake of both dopamine and norepinephrine to a far higher extent which will subsequently make more of the same neurotransmitters available in the brain.
How They Compare
In places where Sunosi is prescribed, a few differences come up in how doctors and patients discuss the two:
Mechanism. Sunosi’s dopamine and norepinephrine reuptake inhibition is a more direct, defined mechanism than Modafinil’s broader, less precisely mapped effect on wakefulness pathways.
Onset and duration. Sunosi tends to have a relatively fast onset and is generally taken once daily upon waking, with effects lasting through much of the day, similar in spirit to how Modafinil is dosed, though the two aren’t identical in their time-action profile.
Approved conditions. Sunosi is approved for narcolepsy and obstructive sleep apnoea specifically. Modafinil covers those two plus shift work sleep disorder, which Sunosi doesn’t carry an approval for.
Side effect profile. Both can cause headache, nausea, and reduced appetite. Sunosi’s product information also notes effects on heart rate and blood pressure as something to monitor, which is a relevant consideration for anyone with cardiovascular risk factors, similar in principle to cautions already applied to Modafinil.
Why This Comparison Matters Less in Australia, Practically
Since Sunosi has not yet been approved for use in this country, for most Australians this is not really a matter of “which should I ask the doctor for”. It is rather an insight into the fact that there are other things happening outside. If you are thinking about treatment options for narcolepsy or sleepiness brought about by sleep apnoea, then the main thing your doctor has to offer, via normal prescription, is Modafinil (in addition to other medicines that your doctor is likely to talk about).
If You’ve Read About Sunosi Online
There are patient forums or articles internationally that refer to Sunosi as though it is an option to which all patients have normal access. These sources, however, may mislead readers in their interpretation of what is really available if one tries to understand what may help in the treatment of his/her condition in Australia.
You can also ask a sleep specialist if there might be any chance of the drug being available in this country to which case the doctor can inform you about registration and availability issues related to Sunosi. Meanwhile, narcolepsy or sleepiness due to sleep apnoea are treated in Australia using only those medicines or therapies that are available at the moment.
The Bottom Line
Sunosi and Modafinil both treat excessive daytime sleepiness, but they work through different mechanisms and, most importantly for Australians, only one of them is actually accessible here. Modafinil remains a well-established, accessible option for narcolepsy, sleep apnoea, and shift work sleep disorder in Australia. If you’re exploring treatment options, that conversation is best had directly with your GP or sleep specialist, based on what’s genuinely available to you.
This article is general information only and isn’t medical advice. Always discuss treatment options for excessive daytime sleepiness with your GP or specialist.