Orthostatic Hypotension / Syncope Secondary to PTSD (Treated with Prazosin or Alpha-Blockers)

Yes. Under 38 CFR § 3.310(a), any disability proximately caused or chronically worsened by a service-connected condition is itself service-connected. Orthostatic Hypotension / Syncope is a documented secondary pairing for PTSD (Treated with Prazosin or Alpha-Blockers) with strong medical evidence. A nexus letter from a qualified physician linking the two conditions is the most reliable way to establish this connection.

The gold standard is a private nexus opinion stating — to at least a 50% probability ("at least as likely as not") — that the secondary condition was caused or aggravated by the primary service-connected condition. Peer-reviewed medical literature supporting the physiological mechanism strengthens the nexus. Treatment records documenting the onset or worsening of the secondary condition in temporal relation to the primary are supporting evidence.

The VA rates Orthostatic Hypotension / Syncope separately under its own 38 CFR Part 4 diagnostic code, then combines it with PTSD (Treated with Prazosin or Alpha-Blockers) and all other service-connected ratings using the combined ratings formula under § 4.25. The formula applies the whole-person concept: a 50% combined existing rating plus a new 30% rating yields 65% (rounded to 70%), not 80%.

38 CFR § 3.310(a) states: "Disability which is proximately due to or the result of a service-connected disease or injury shall be service connected." The aggravation variant under § 3.310(b) applies where the primary condition permanently worsens a pre-existing disability beyond its natural progression. Both standards require a showing of nexus — a medical or scientific link between the primary condition and the secondary.

The medical evidence supporting Orthostatic Hypotension / Syncope as secondary to PTSD (Treated with Prazosin or Alpha-Blockers) is rated strong. Prazosin, the first-line alpha-1 adrenergic blocker prescribed for PTSD-related nightmares, produces orthostatic hypotension as a direct pharmacological effect. Alpha-1 blockade reduces peripheral vascular resistance and impairs the compensatory vasoconstriction normally triggered by standing, causing blood pressure drops of 20+ mmHg systolic upon position change. Military-age veterans often tolerate higher doses for nightmare suppression, increasing orthostatic risk. Syncope (fainting) from prazosin-induced hypotension is a documented adverse effect occurring in 1-5% of patients at therapeutic doses. The resulting falls can cause secondary traumatic injuries. Other PTSD medications (trazodone, quetiapine, doxazosin) carry similar orthostatic risk.

The VA will not solicit nexus evidence on your behalf for secondary claims. In practice, a written nexus opinion from a private physician or independent medical examiner is essential — the VA's Compensation & Pension (C&P) examiner is not required to produce a favorable nexus opinion, and the VA has discretion to weigh competing opinions. Submitting a private nexus letter at the time of filing is the most reliable strategy.